He pretended
to be studying
to be studying
（study） when his mother stepped into his room．

【答案】to be studying

【解答】

【點評】

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發(fā)布：2024/6/27 10:35:59組卷：31引用：3難度：0.7

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發(fā)布：2024/8/6 8:0:9組卷：3引用：1難度：0.5
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A．to expand	B．to have expanded
C．to be expanded	D．to be expanding

A． being wondering	B． to have wondered
C． to be wondering	D． having wondered

He pretendedto be studyingto be studying（study） when his mother stepped into his room．