After we_____for three hours, we felt very tired and thirsty.

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问题 After we_____for three hours, we felt very tired and thirsty.

选项 A、walk
B、run
C、drive
D、walked

答案D

解析 从“…we felt very tired…”中可以看出是过去时态的句子,所以前面的状语从句也要与之保持一致。故只有“walked”表达。
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