问题描述：
—___we take a rest i can't go any further .
---you ___be tired ----we're only walked for 20 minutes!
Amay ,mustn't B shall ,can't C can;may not D shouldn't ;wouldn't
the answer is B,tell me why
---you ___be tired ----we're only walked for 20 minutes!
Amay ,mustn't B shall ,can't C can;may not D shouldn't ;wouldn't
the answer is B,tell me why
问题解答：
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