【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(lái)之前下車，否則你會(huì)受傷的。A. stops動(dòng)詞三單，停止; B. will stop將來(lái)時(shí)態(tài)，將停止；C. has stopped完成時(shí)態(tài)的結(jié)構(gòu)，已經(jīng)停止；D. stopped動(dòng)詞過去式，停止。本句為before引導(dǎo)的時(shí)間狀語(yǔ)從句，時(shí)態(tài)從句遵循“主將從現(xiàn)”，所以從句用一般現(xiàn)在時(shí)態(tài)。故選：A。

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