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

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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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