1.We were told that we should follow the main road--------we

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1.We were told that we should follow the main road--------we reached the central railway station.
a while b until
key:b
我觉得b应该改为we were told that we should not follow the main road until we……….
2.if you are feeling so tired,perhaps a little sleep would----------
a act b help c serve d last
key:b为什么?
3.is this hotel------they stayed at last year?
A the one b where
Key:b
A为什么错?不是this hotel is the one (that)they stayed at last year?
4.---------about wild plants that they decided to make a trip to shanghai
a how curious the couple were
b so curious were the couple
key:b
a不是对的么?
5.they have introduced an advanced measuring device and I think it------be very expensive
A have to b must
Key:a
b为什么不对?

第一题:首先A选项句子不合逻辑while是一边..一边...有轻微转折,B选项符合句子逻辑,虽然初高中平时多见not ...until的句型,但不都是这样,not ...until一般用于瞬间动词.而此句意思是:我们被告知要一直延着大路走直到走到火车站.而改后不通.
第二题:A act为表演,行动的意思C serve是服务的意思 D last作动词是持续的意思,A C D均不符句意.而选B则可理解为:如果你感到累了,睡一小会儿会有帮助.
第四题:此处是So...that的句型,意思是如此好奇,以至于.而用A则不可以,So在句首倒装
第五题:have to和must的区别是一个是客观的,一个是主观的.此处某样东西的贵是客观的,非主观的.I must do my homework now because tomorrow I should hand it in.此处是主观的.
PS:我觉得第三题错了

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