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当他母亲进来时，他假装在看书。
He pretended to be reading when his mother came in.
youdao
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当老师进来时他假装在看书。
He pretended to be reading when the teacher entered.
youdao
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我进来时，他假装在看书。
When I came in, he pretended to be reading.
youdao
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我进来时，他假装在看书。
When I came in, he pretended to be reading.
youdao