【題目】Listen! Who ________ the front door?

A. is knocking B. knocks on C. is knocking on D. knocked

【答案】C

【解析】

句意:聽!誰在敲門?選項(xiàng)中knock為不及物動詞,其后接賓語時(shí),應(yīng)加介詞on/at。由“Listen!”可知動作正在進(jìn)行,應(yīng)用現(xiàn)在進(jìn)行時(shí),故選C。

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