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  3. Having no key to the door, the poor boy________anxiously in the rain for one and a half hours before his mother came back.

Having no key to the door, the poor boy________anxiously in the rain for one and a half hours before his mother came back.

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问题 Having no key to the door, the poor boy________anxiously in the rain for one and a half hours before his mother came back.
选项 A、was waiting
B、had been waiting
C、has waited
D、would wait
答案B
解析 根据句意，从句中的came back和主句中的时间状语for one and a half hours(一个半小时)可知，“焦急地等待”是在“回来”之前一直在进行的动作，所以主句应用过去完成进行时，即主句谓语动词用“had been+现在分词”的形式，表示过去某个动作发生之前一直在进行的动作。故选B。
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