—Was the driving pleasant when you vacationed in Mexico (墨西哥) last summer? —No, it______ for four days when we arrived so tha

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问题 —Was the driving pleasant when you vacationed in Mexico (墨西哥) last summer?    —No, it______ for four days when we arrived so that the roads were very muddy.

选项 A、was raining
B、had been raining
C、would be raining
D、have rained

答案B

解析 从句用过去时态,主句应该与之一致,因有"for four days",所以应该用完成时态表示过去持续的动作。
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