1 “Hi,Maria.I was in the neighbourhood,so I thought i 'd drop by.”中“I 'd drop 2 I first Met Hunter two years ago when we() at Zhejiang University together.A have worked B were working C had been working D had worked.这里我觉得CD都可以

1 “Hi,Maria.I was in the neighbourhood,so I thought i 'd drop by.”中“I 'd drop 2 I first Met Hunter two years ago when we() at Zhejiang University together.A have worked B were working C had been working D had worked.这里我觉得CD都可以
1 “Hi,Maria.I was in the neighbourhood,so I thought i 'd drop by.”中“I 'd drop
2 I first Met Hunter two years ago when we() at Zhejiang University together.
A have worked B were working C had been working D had worked.这里我觉得CD都可以啊,都是关于过去完成时的,但答案并不是这样的.
3 It was not until 1949 () Chinese people took on a new look.
A that B since C when D which
4 converse和protect有什么区别?
第四题请不要把词典照搬，该题中converse改为conserve

1 “Hi,Maria.I was in the neighbourhood,so I thought i 'd drop by.”中“I 'd drop 2 I first Met Hunter two years ago when we() at Zhejiang University together.A have worked B were working C had been working D had worked.这里我觉得CD都可以
1.顺便拜访
2.B.when可以指时间点或者时间段,由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时
3.C.not until指直到……才……,后面的Chinese people took on a new look缺少了时间状语,用when
4.converse指交谈,不及物动词,protect指保护,及物动词.你应该想问conserve和protect之间的区别吧.
（下面是转载网上的详细解答）protect用作及物动词,意为“保护,保卫,防护”（to keep someone or somthing safe from harm,damage,or illness),用于使人或物免受任何危险、侵袭或伤害,适用范围广泛.
如：protect one's country,(one's sister,one's head,the townspeople,one's interest)等,并常用protect...from 结构.
如：Try to protect your skin from the sun.
A helmet protects your head from injuries.
He raised his arm to protect his child from hurting.
conserve一般说保护自然资源,是指通过有准备、有计划的、明智的方法来保护事物处于安全,防止改变或损坏,如保护人等的权利,义务等
We must conserve our forests if we are to make sure of a future supply of wood.
如果我们想确保未来的木材供应,就必须保护森林.
"People have to learn to conserve water anytime,especially during the drought."
"大家必须学会节约用水,特别是在干旱期间."

1. I'd drop by.意思是我会顺便拜访一下. drop by 固定词组.顺便拜访.
2. 选B. 句子中有two years ago, 表示时间点的词,所以完成时的用法全都不能考虑. 不管过去完成还是现在完成,所以只能选B,B是过去进行时,可以表示过去一段时间的状态,同时跟前半句搭配意思是认识那个人的时候我正在干什么什么也很通顺,所以选B
3. 选A. It was 开头...

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1. I'd drop by.意思是我会顺便拜访一下. drop by 固定词组.顺便拜访.
2. 选B. 句子中有two years ago, 表示时间点的词,所以完成时的用法全都不能考虑. 不管过去完成还是现在完成,所以只能选B,B是过去进行时,可以表示过去一段时间的状态,同时跟前半句搭配意思是认识那个人的时候我正在干什么什么也很通顺,所以选B
3. 选A. It was 开头,强调句,所以用强调句的固定搭配,it is ... that..
4. 这两个词好像没有什么交叉啊...前者是转换,转变之类的意思,后者是保护的意思...要区别什么呢

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第三题，选that. （是一个强调句it is...not untill that的强调句型是常考点） 第二题我觉得选C吧、 一个是过去完成时，一个是过去进行时

觉得1L同学说得都对
就是关于第四题
conserve还有保持的意思吧，多用于保护资源
protect多用于保护人啊什么的……