【題目】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：你不能在公共汽車停下來之前下車，否則你會受傷的。A. stops動詞三單，停止; B. will stop將來時態(tài)，將停止；C. has stopped完成時態(tài)的結構，已經停止；D. stopped動詞過去式，停止。本句為before引導的時間狀語從句，時態(tài)從句遵循“主將從現(xiàn)”，所以從句用一般現(xiàn)在時態(tài)。故選：A。

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