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A:I can’t find my bag.Have you seen it?

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A:I can’t find my bag.Have you seen it?
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A:I can’t find my bag.Have you seen it?
B:No.You _______________________________________(一定是把它放在) behind the door.
I must have put it 如果把have
A: I can’t find my bag. Have you seen it?
我找不到我的包.你见过我的包吗?
B: No. You must have put it behind the door.
没见过.你肯定是把它放在门后了.
must是语气助词,后面接动词原形.放包应用过去完成时,had put it.
由于在must后面,所以变成 must have put it.