16．-Why didn't you try to finish your test？
-I tried to，but _________ I could，the bell rang．（　�。�
A．untilB．whenC．afterD．before

分析 ---你為什么不盡力完成你的考試？
---我盡力了，但在我做完之前，鈴聲就響了．

解答 答案：D．根據(jù)選項 until直到…，before在…前，when當(dāng)…時，before 在…之前，after在…之后，再結(jié)合句意，我還沒來得及做完，鈴聲就響了，可知此處缺少了一個引導(dǎo)時間狀語從句的連接詞，故D正確．before…可翻譯為，還沒來得及…

點評 本題考查時間狀語從句的連接詞，在充分分析句型再結(jié)合語義的基礎(chǔ)上便能選出正確答案，同時要注意其他選項的意思，

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