问题: 选什么? 为什么?
Mary worked very carefully so that she ________ not make any mistakes.
A. could B. should C. would D. must
解答:
选: C. would
主句中谓语动词是过去式,worked告诉我们时间的基点是过去;
so that在这里表示目的“为使,以便”,其后应表达worked very carefully 的目的,从句中谓语应该使用过去将来时,would是will的过去式,常用来表达过去将来时。
请参看下面以现在时间为基点的例句:
I want to leave now so that I won't be late.
我现在就要走了,以便不致迟到。
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