帮个忙回答一下:-______ Jack _______ (clean) his room last weekend?-Yes,he did.

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帮个忙回答一下:-______ Jack _______ (clean) his room last weekend?-Yes,he did.
帮个忙回答一下:-______ Jack _______ (clean) his room last weekend?-Yes,he did.

帮个忙回答一下:-______ Jack _______ (clean) his room last weekend?-Yes,he did.
1 Did
2 clean

did, clean

Did Jack clean his room last weekend? -Yes,he did

Did clean

Did clean!这是个一般疑问句。last weekend和它的肯定回答表明该句是过去式

did,clean。