You can not borrow books from the school library______you get your student card.
A,before    B,if       C,while     D,as
A

試題分析：句意，在你取得學(xué)生卡之前，你不能從學(xué)校圖書館借書。Before……之前 if 如果 while 然而 as 當(dāng)……時(shí)，根據(jù)題意，故選A。
點(diǎn)評(píng)：解答這類題目，關(guān)鍵是理解題干意思以及各選項(xiàng)連詞的意思，可以像數(shù)學(xué)中的代入法一樣，依次把各個(gè)選項(xiàng)意思放入句子中進(jìn)行比較，不難選出正確答案。
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