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We don't know if it _______ this weekend. If it _________, we will go on a trip.

A．rains; won’t rain	B．will rain; isn’t rain
C．rains; rains	D．will rain; doesn’t rain

第一空主要考查的if引導的賓語從句，從句的時態要根據自己本身的時態來決定，而第二空，主要考查的if 引導的條件狀語從句，在if

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