作业帮Want____they____[buy]for the picnic?怎么填空?现在完成时.
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Want____they____[buy]for the picnic?怎么填空?现在完成时.
Wanthavetheybought[buy]for the picnic?
have they bought will they buy did they buy 我觉得都可以
have ... bought
what have they bought for the picnic?