Question

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
选B,C和D为什么不对

Answer 1

这个是客观事实，是条件句，不需要虚拟。所以不选C
条件句中一般现在时表将来，不需要用将来时，所以不选D

Answer 2

根据整句的格式，选b。跟to be watered相对

Answer 3

用不定式to do表目的，且主将从现用are ^_^

Answer 4

选择C，后面是虚拟语气。