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

分析 當(dāng)你開始試驗(yàn)時(shí)請(qǐng)帶上防護(hù)眼鏡.

解答 答案是A.考查祈使句,構(gòu)成是:動(dòng)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(shí)間狀語(yǔ)從句,故答案是A.

點(diǎn)評(píng) 解答此類問(wèn)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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