In such dry weather the flowers will have to be watered if they A. have survivedB. are to

问题补充：

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：

A. have survived

(答案→)B. are to survive

C. would survive

D. will survive

解析：此句的主句是将来时，条件状语从句要用一般现在时表示将来时。if they are to survive表示“如果它们要活下来”。

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