12．The police needed more evidence       they could draw a conclusion．（　�。�
A．sinceB．afterC．beforeD．until

分析 警方需要更多的證據(jù)才能得出結(jié)論．/在警方得出結(jié)論之前，他們需要更多的證據(jù)．

解答 答案C．
since意思是"自從…以來(lái)"時(shí)，引導(dǎo)時(shí)間狀語(yǔ)從句；意思是"既然"時(shí)，引導(dǎo)原因狀語(yǔ)從句．a(chǎn)fter"在…之后"，引導(dǎo)時(shí)間狀語(yǔ)從句．before"在…之前；才…"，引導(dǎo)時(shí)間狀語(yǔ)從句．until"直到"，引導(dǎo)時(shí)間狀語(yǔ)從句．這四個(gè)從屬連詞有一個(gè)共同點(diǎn)是都可以引導(dǎo)時(shí)間狀語(yǔ)從句，但從動(dòng)作發(fā)生的時(shí)間上來(lái)分析可知，needed發(fā)生在could draw之前，故答案選C．

點(diǎn)評(píng) 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關(guān)系，再確定相應(yīng)的連詞，同時(shí)注意不同的連詞的語(yǔ)義及用法區(qū)別．

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