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【题目】It's a pity that some students waste energy _________ on line.

A.to chatB.chattingC.chatD.to chatting

【答案】B

【解析】

句意:很遗憾有些学生浪费精力在网上聊天。

考查非谓语。to chat聊天,动词不定式;chatting聊天,现在分词或者动名词形式;chat聊天,动词原形;to chatting聊天,介词+动名词形式;根据句子结构分析可知,这里表达的是“浪费精力做某事”,英语是waste energy in doing sth,所以这里应该用doing形式,故选B

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