Suddenly he heard someone ______ gently on the window.

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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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