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4.-I don't know if Dr.White            to the party next week.
-I think he will come if he            free.(  )
A.comes; will beB.will come; will be
C.comes; isD.will come; is

分析 -我不知道下周怀特医生是否会来参加聚会.
-我认为如果他有空他会来的.

解答 答案:D 根据I don't know if Dr.White…可知这是一个由if引导的宾语从句,主句的时态为一般现在时,根据规则从句根据句子的需要可以用任何一种时态;根据时间状语next week,判断从句应用一般将来时,其构成为will+动词原形,结合选项应为will come;根据第二个句子的结构及时态,可知此句是一个由if引导的条件状语从句,时态遵循主将从现的原则,即主句用一般将来时,含有if的从句用一般现在时表将来;从句的主语为第三人称单数he,所以用is.综合以上分析,故选D.

点评 此题考查时态的综合运用.做此题的关键是分清由if引导的两种从句的区别,尤其是在时态上的区分.把握住主要的时态规则做此题就不难了.

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