--Why did you come so late?--the bus was crowded. We ______ waiting for half an hour.

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问题 --Why did you come so late?--the bus was crowded. We ______ waiting for half an hour.

选项 A、were kept
B、kept
C、have kept
D、had kept

答案A

解析 本句意为:因为车上人太多,我们被迫等了半个小时。故本题答案为A。
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