问题
选择题
 —We weren’t sure which way to go. In the end we turned right.—You _____ the wrong way. You _____ left.
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答案
A
首先来确定时态是在描述过去，故先排除B，再根据含义来选正确的情态动词，既然说对方走错了路，那么下面肯定是告诉对方“本该”，用should have done结构。
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