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Youshouldunderstandthemathproblemnow,youhavehadit

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問題詳情:

Youshouldunderstandthemathproblemnow,youhavehadit

You should understand the math problem now, you have had it ________three times.

A. explaining         B. to explain             C. explained        D. explain

【回答】

C

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題型:選擇題

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