The crowds were excited when the soldiers finally arrived because they ________ for three hours.

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问题 The crowds were excited when the soldiers finally arrived because they ________ for three hours.

选项 A、had to wait                                                  
B、had been waiting
C、were to wait                                                
D、have waited

答案B

解析 从句意可知,群众一直在等待士兵们,直到他们到来,应用过去完成进行时,故选B。
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