问题
选择题
John waited at the bus-stop for nearly half an hour the bus finally arrived .
A．when
B．as
C．before
D．while
答案
23．C
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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John waited at the bus-stop for nearly half an hour the bus finally arrived .
A．when
B．as
C．before
D．while
23．C
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。
