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

问题补充：

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

A. have survived

B. would survive

C. are to survive

D. should survive

答案：

A. have survived

B. would survive

(答案→)C. are to survive

D. should survive

解析：句意：在如此干燥的天气中如果这些花一定要活着的话，它们必须被浇。在此题中be to do 表示将来，一定要发生，注定会发生，所以选C。