John waited at the bus-stop for nearly half an hour _____ the bus finally arriv
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John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .A.when | B.as | C.before | D.while |
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答案
C |
解析
before引导时间状语从句,公共汽车来之前,我已等了将近半个小时了。故选C。 |
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