The teacher asked US to write a in one hour.

The teacher asked US to write a in one hour.

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--What was he doing at this time yesterday?--He ________ to

--What was he doing at this time yesterday?--He ________ to sing a song in Engli

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当事人订立合同,应当具有(  )。

当事人订立合同,应当具有(  )。

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下列选项中,符合《合同法》规定的无效合同的情形是(  )。

下列选项中,符合《合同法》规定的无效合同的情形是(  )。

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