【題目】Someone ______ at the door. Can you open it?
A.knocks
B.knocked
C.is knocking
D.was knocking

【答案】C
【解析】句意：有人正在敲門。你可以去開一下嗎? 根據(jù) Can you open it? 你可以去開一下嗎? 推斷可知應(yīng)該是：現(xiàn)在有人正在敲門，應(yīng)該用現(xiàn)在進行時態(tài)．現(xiàn)在進行時態(tài)構(gòu)成：助動詞be+ doing，故選C。

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