In such hot weather the crops will have to be watered if they                  .
A．have survived
B．a(chǎn)re to survive
C．would survive
D．will survive
B
主句為將來時態(tài)，條件狀語從句要用現(xiàn)在時態(tài)表將來，故C項和D項不對；A項雖屬現(xiàn)在時態(tài)，但題意不需要完成的意義，B項中的be to do 表示“想要”。
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