两道英语填空题,

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We can't jump 200 times in one minute
Must he clean all the dishes by himself?
Yes,he must
No,he needn't
======以下答案可供参考======
供参考答案1:
1. We can't jump 200 times in one minute.
供参考答案2:
1can改为can't2must提到最前，后面不变 回答：Yes,he must. No,he mustn't