John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .

         A. when B. as        C. before         D. while

C


解析:

before引導(dǎo)時(shí)間狀語(yǔ)從句,公共汽車(chē)來(lái)之前,我已等了將近半個(gè)小時(shí)了。故選C。

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