两个句子对错~是They sold twenty head of cattle this week.还是They sold twenty heads of cattle this week.为什么?是不是和some kinds of与some kind of的用法相同?

两个句子对错~是They sold twenty head of cattle this week.还是They sold twenty heads of cattle this week.为什么?是不是和some kinds of与some kind of的用法相同? They are advertising them in the paper for three or even four times the money they sold them for.我感觉这句话不对.请帮我分析一下句子结构.句子里的them是指tickets. 1.Mary went to the box office at lunch time,but all tickets had sold out1.Mary went to the box office at lunch time,but all tickets had sold out 2.Mary went to the box office at lunch time,but all tickets had been sold out这两个句子哪个是对 弱电图例中 TP/TN/TW 分别代表的是什么?我知道TP是电话插座,其他两个是什么? tw?ty问号字母是啥 判断下列句子对错 判断句子的对错 the flowers were so lovely that they were sold in no time为什么这个句子用过去时? The books sell well.为什么不用被动语态相关知识讲一下.我还看到一个句子是They are sold in the market.为什么这个就是被动的呢 两个质数的积一定是合数判断对错 两个质数的积一定是合数()判断对错,为什么? 判断对错 两个不同质数的积一定是合数 对错题：两个奇数一定是互质数 任意两个自然数的积一定是合数.对错? 两个假分数的积可能是整数.( ) 判断对错 两个连续偶数得积一定是合数(判断对错) 英语单词中以tw开头的音标均是以/tw/开头,但为什么two是/tu:/ They were sold very well中文是什么意思