【題目】I heard someone ________ at the door. I opened the door and found a postman outside.

A. knocks B. knocking

C. to knock D. knocked

【答案】B

【解析】

句意：我聽見有人敲門。我打開門，發(fā)現(xiàn)一個郵遞員在外面。hear sb. doing sth. 聽到某人正在做某事；用動名詞做賓補。故選B。

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