【題目】While I _________ a novel, someone_________ at the door.
A． read; was knocking

B． read; knocked

C． was reading; knocked

D． was reading; was knocking

【答案】C

【解析】本題考查連詞的用法。while作連詞時，引導(dǎo)時間狀語從句，句意：當(dāng)我正讀小說的時候，有人敲門。故選C

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