公共英语一级
单选题[A]do
[B]doing
[C]done
[B]doing
[C]done
参考答案：B进入在线模考
[B]。考查动词的非谓语形式。由句子结构可知，填入的词在句中作主语，而homework又是填入动词的宾语，因此填人表主动的现在分词形式doing。
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