They ______ so tired if they ______ for a whole day.

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问题 They ______ so tired if they ______ for a whole day.

选项 A、wouldn’t feel, didn’t walk
B、wouldn’t feel, weren’t walking
C、wouldn’t be feeling, weren’t walking
D、wouldn’t be feeling, hadn’t been walking

答案D

解析 走路是已经过去的事情,并且持续了一天的时间,用过去完成进行时。
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