16．You can't borrow books from the school library ______ you get your student card．（　�。�
A．beforeB．ifC．whileD．as

分析 在你拿到你的學(xué)生卡之前你不能從學(xué)校圖書(shū)館借書(shū)．

解答 答案：A
before之前；if如果；while當(dāng)…時(shí)候；as因?yàn)�，作為；句意表達(dá)的是你拿到學(xué)生卡后才能借書(shū)，要用before來(lái)構(gòu)成．故選A．

點(diǎn)評(píng) 本題考查時(shí)間狀語(yǔ)從句，before表示在…之后，…才…，是比較重要的用法．

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