Question

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

Answer 1

B

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”。