【題目】I don't know if Jack ______back today. If he____back, I'll call you.
A.will come; will come
B.comes; will come
C.comes; comes
D.will come; comes

【答案】D
【解析】句意:我不知道杰克今天是否會(huì)回來(lái)。如果他回來(lái),我會(huì)打電話給你?疾閯(dòng)詞時(shí)態(tài)。本題含有兩個(gè)if,都是連詞,但意義不同。前句中的if意為“是否”,引導(dǎo)賓語(yǔ)從句,和whether(是否)意思相同。后句中的if意為“假如”,引導(dǎo)條件狀語(yǔ)從句,主句用將來(lái)時(shí),if從句用現(xiàn)在時(shí)表示將來(lái)。根據(jù)句意和時(shí)態(tài),可知選D.

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