In such dry weather, the flowers will have to be watered if they ____________
A．have survivedB．a(chǎn)re to survive
C．would surviveD．will survive
B
此句的主句是將來時，條件狀語從句要用一般現(xiàn)在時表示將來時。if they are to survive表示“如果它們要活下來”。
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