1.-This experiment is of particular importance to all of us

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1.-This experiment is of particular importance to all of us
-I see.We will carry on with it_____we can get enough money.
A.unless B.though
C.whether D.until
2.A new townhas been built____used to be an old one destroyed by Wenchuan Earthquake.
A.in which B.which
C.there D.where
3.The trapped cow must have been very hungry when saved,_____?
A.wasn"t she B.didn"t she
C.hasn"t she D.hadn"t she
4."Grandpa,how came you have so much lines on your hand?"
4.为什么这句助动词用came

1,选C.whether:不管、无论
2,选D.这里缺少句子成分be built(in the place),所以需要一个关系副词.
3,选A.反意疑问句中含有Must的情况对过去事实的推测,表示动作的时候用did 当助动词,表示状态时用was,如：
Mr Green must have been punished for his being rude at the meeting,didn‘t he (格林先生一定因为昨天在会上鲁莽的行为被处罚了,是吗?）被处罚表示一个动作
She must have been a policeman ,wasn't she （她过去一定是个警察,是吗?）是警察表示一种状态
4,come不是一个助动词.How come……是一个词组.“怎么会……?”

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