【題目】He pretended when his mother stepped into his room.

A. to study B. studying

C. to be studying D. to have studied

【答案】C

【解析】

考查不定式用法。不定式的一般式to do說明該動作在謂語動詞之后發(fā)生；進行時to be doing表示兩者同時發(fā)生；to be done表示被動。句意：當他的媽媽走進房間的時候，他假裝在睡覺。根據(jù)句意說明兩個動作同時發(fā)生，故使用不定式的進行時。故C正確。

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