2. 外语
  3. Suddenly he heard someone ______ gently on the window.

Suddenly he heard someone ______ gently on the window.

admin2008-11-13  57
问题 Suddenly he heard someone ______ gently on the window.
选项 A、knock
B、knocking
C、knocked
D、to knock
答案B
解析 hear是感官动词，其后的宾语补足语可以是do，doing，done。它们的用法是：若宾语是人，强调的是结果则用do，若宾语是人强调的是动作的正在进行则用doing；若宾语是物且作宾补的动词与宾语又是动宾关系则用done。
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成人本科学位英语

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