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问题: In such dry weather , the flowers will have to be watered if they ____.

In such dry weather , the flowers will have to be watered if they ____.
A. have survived
B. are to survive
C. would survive
D. will survive
答案选B,why?

解答:

be+ to do表将来,这句话意思是,这么干燥的天气花要活的话就必须浇水.c和] d也表将来,但will最基本的意思是打算,计划.并且would是过去时态不能用