【題目】That's why I help brighten people's days. If you ________， who's to say that another person will?

A. didn't B. don't

C. weren't D. haven't

【答案】B

【解析】試題分析：本題考查條件狀語從句中動詞的時態(tài)。

結合句意可知，空格處句子表達“如果你不去做的話，誰敢說還有其他人去做呢？”，是對現(xiàn)在的一般性假設，主句用將來時，從句用一般現(xiàn)在時，構成“主將從現(xiàn)”。故正確答案為B。

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