告诉我为什么选B,不是应该是D吗

告诉我为什么选B,不是应该是D吗 为什么选D?不应该是生态系统吗? The school is over ___ 3:00 pm A.in B.for C.during D.around 答案是选D, 为什么没有介词at不是应该是over at ___ 3:00 pm 吗 为什么选b,不是选d 一道英语语法题._____ he shout in the vicinity of a wall,an echo will come back.A.Should B.If C.When D.Though选A的话,不是应该是虚拟吗?那主句为什么不用would? unless our manager objects to Tom-----the club ,we shall accept him as a member A.to joinB.joiningC.being joined D.having joined为什么选B啊?不是应该是tom‘sjoining吗? the speaker rasied his voice but still couldn't make himself__.A hear B to hear C hearing D heardmake 后面不定式不带to,应该选A吗?但是正确答案好像是D,被动不是应该是to be done 省略了to 也应该是be heard吗？为什么 Stephen Hawking believes that the earth is unlikely to be the only planet_____life has developedA. that B. where C. which D. whose那位大师可不可以告诉我为什么不能选A,前面不是有the only吗?不 The questions ( ) at the meeting were very important.A.to discuss B.discussing C.discussed D.were discussed为什么不是被动,我觉得应该是D. 一个市场上只有一个厂商,生产一种没有替代的产品,这样的市场结构被称为?A竞争垄断 B完全垄断 C寡头垄断 D完全竞争,为什么呀,不是应该是B吗? 第九题,为什么b,我觉得应该是d啊. don't worry three fourth of the work _____ todaya.has finished b.has been finishedc.have finished d.have been finished work 不是不可数名词吗?那应该是c 可是答案是d.为什么呢?我搞错了 我选的是B 第五题可以告诉我为什么选D吗? 选择题最后一题,为什么选B我知道不是B就是D，为什么D错 图下方的这道题为何选D,不是应该是C的传统型吗? 英语年龄的表达he has a ----- daughterA seven-day old B seven -days-oldC seven day D seven days为什么啊 不是应该 seven -day-old 或 seven days old的吗不是应该是seven -day-old 比如 16-year-old girl 怎么又会选seven-day old 求助一道英语单选,At last,the boy found themselves in a pleasant park with trees providing shade and__down to eat their picnic lunchA.to sit B.sat C.sitting D having sat为什么答案是B,不是C,sitting不应该是主动关系吗,如果B是 The twins and I ____ agree with each other.A.both B all C are all我认为这道题应该是选C,但是我答案是B ,请告诉我为什么,这和主语有关系吗?