9．_______ the protective glasses when you begin the experiment，please．（　　）
A．WearB．WearingC．WornD．To wear

分析 當你開始試驗時請帶上防護眼鏡．

解答 答案是A．考查祈使句，構(gòu)成是：動詞原形+其他．題干前半部分祈使句，后半部分是when引導(dǎo)的時間狀語從句，故答案是A．

點評 解答此類問題，首先需要判斷題干所屬的句型，然后結(jié)合句子所缺成分和句型構(gòu)成選擇正確答案．

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