问题
选择题
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
答案：B
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”。