问题补充：
In such hot weather the crops 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：主句为将来时态，条件状语从句要用现在时态表将来，故C项和D项不对；A项虽属现在时态，但题意不需要完成的意义，B项中的be to do 表示“想要”。
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