11．John waited at the bus-stop for nearly half an hour _____ the bus finally arrived．（　�。�
A．whenB．asC．beforeD．while

分析 在公共汽車最后來之前，約翰在公交站頭已等了將近半個小時了．

解答 答案：C 根據(jù)選項 when和while都有"當(dāng)…時"之意，when既可以跟延續(xù)性動詞，又可以跟瞬間動詞，while只可跟延續(xù)性動詞，as強調(diào)一邊，一邊，before在…之前，再結(jié)合句意，在公共汽車最后來之前，約翰在公交站頭已等了將近半個小時了．可知此處應(yīng)是在…前，故C正確，

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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