7．It's no use ______ about it．You can't do anything to change it．（　�。�
A．worriedB．to worryC．worryingD．worry

分析 為此擔(dān)心是沒有用的．你無法做任何事件來改變它．

解答 答案是C．本題考查動(dòng)名詞做主語的固定句型．It's no using doing sth表示"做…是沒有用的"，其中It 是形式主語，真正的主語是動(dòng)名詞；由此判斷答案是C．

點(diǎn)評(píng) 對(duì)于非謂語動(dòng)詞的選擇，首先要根據(jù)句子的結(jié)構(gòu)判斷句中缺少的是謂語動(dòng)詞還是非謂語動(dòng)詞；如果是非謂語動(dòng)詞，在理解非謂語動(dòng)詞的基本用法的基礎(chǔ)上再根據(jù)句子的結(jié)構(gòu)做出判斷．

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