No sooner had I closed the door than somebody started knocking ________ it.

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问题 No sooner had I closed the door than somebody started knocking ________ it.

选项 A、on
B、with
C、to
D、for

答案A

解析 本题考查介词用法。knock on/at the door“敲门”。句意为:我刚关上门就有人敲门。
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