John waited at the bus-stop for nearly half an hour the bus finally ar
题型：不详难度：来源：
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
| 23．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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