. You’re so tired. We should have driven the car .A. by turnB. in turnC. in turnsD. on tu

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A. by turn
(答案→)B. in turn
C. in turns
D. on turn
解析：短语辨析。by turn 逐个的； in turn 轮流，依次；in turns 无此用法；on turn无此用法。句意：你太累了，我们应该轮流开车。结合语境可知选B。