John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
A．whenB．a(chǎn)s C．before D．while
C
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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