爷爷正在看书。爸爸正在写电子邮件。妈妈。

Grandpa is reading a book. Dad is writing ane-mail. Mom.

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当他妈妈回来时，他假装正在看书。

He pretended to be reading a book when his mother came back.

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当他妈妈回来时，他假装正在看书。

He pretended to be reading a book when his mother came back.

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