Johnwaitedatthebus-stopfornearlyhalfanhour
問題詳情：
John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
A. when B. as C. before D. while
【回答】
C
知識點：連詞
題型：選擇題
問題詳情：
John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
A. when B. as C. before D. while
【回答】
C
知識點：連詞
題型：選擇題
