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20.They left for the airport early this morning _________ they would have enough time to enjoy lunch there before boarding.(  )
A.so thatB.in caseC.as thoughD.even if

分析 他们一早出发去机场,以便于在登机之前他们能有充足的时间在那儿吃顿午餐.

解答 答案:A.根据they would have enough time to enjoy lunch there before boarding可知他们一早出发去机场的目的是在登机之前他们能有充足的时间在那儿吃顿午餐,所以后句是前句的目的,因此答案是A so that"为了,以便于".其他选项的含义分别是B"以免";C"好像";D"即使".

点评 考查从属连词.
so that引导目的状语从句时,表示"以便;为了",从句中常使用can/could/may/might/will/would/should等情态动词或助动词;引导结果状语从句时,从句中一般不用can和may等词,在so that前可以用逗号,意思是"因此;所以".如:The little boy saved every coin so that he could buy his mother a present on Mother's day.

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