题目内容

【题目】You must not get off the bus before it _______, or you may get hurt.

A. stops B. will stop C. has stopped D. stopped

【答案】A

【解析】

句意：你不能在公共汽车停下来之前下车，否则你会受伤的。A. stops动词三单，停止; B. will stop将来时态，将停止；C. has stopped完成时态的结构，已经停止；D. stopped动词过去式，停止。本句为before引导的时间状语从句，时态从句遵循“主将从现”，所以从句用一般现在时态。故选：A。

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