If it ______ tomorrow, our picnic _______ to be put off. 
A．rains;wouldhave
B．shouldrain;wouldhave
C．rains;has
D．wouldrain;wouldhave
B
此題考查的是if條件從句與將來(lái)事實(shí)相反的虛擬語(yǔ)氣，條件句使用主語(yǔ)+should +do或+did/were或were to do 三種形式，主句使用could/might/would +do。因此選B。
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