问题描述:
He is very happy to do his homework.这句话既有be动词is,又有助动词do,
并且在啥情况下可以有be动词和助动词同用?
并且在啥情况下可以有be动词和助动词同用?
问题解答:
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问题描述:
问题解答:
我来补答