He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.A．whyB．howC．becauseD．whether-高中英语-n多题

◎ 题干

He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.

A．why

B．how

C．because

D．whether

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◎ 解析

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◎ 知识点

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◎ 相似题

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