He was awakened by_____knocking on the window.

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问题 He was awakened by_____knocking on the window.

选项 A、someone’s
B、someone
C、mine
D、him

答案B

解析 动名词。动名词做介词by的补足语,当动名词的主语是不定代词或指示代词时不用属格,而用通格,故选B。C项是名词性物主代词,D项与句子主语指代不清。
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