【題目】We are not sure if it________ tomorrow. If it________, we won't climb the South Hill.
A.will snow; snows
B.will snow; will snow
C.snows; snows
D.snows; will snow

【答案】A
【解析】句意:我們不確定明天是否會下雪。如果下雪,我們就不去爬山。連詞if有兩種用法,一是引導(dǎo)賓語從句,意思是“是否”,當(dāng)主句是一般現(xiàn)在時態(tài)時,從句可為需要的任意時態(tài);二是引導(dǎo)條件狀語從句,意思是“如果”, 時態(tài)遵循“主將從現(xiàn)”。故選A。

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