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(lái)之前，約翰在公交站頭已等了將近半個(gè)小時(shí)了．

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

點(diǎn)評(píng) 本題考查時(shí)間狀語(yǔ)從句的連接詞，在充分分析句型再結(jié)合語(yǔ)義的基礎(chǔ)上便能選出正確答案，同時(shí)要注意其他選項(xiàng)的意思，

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