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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