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— Do you know ____ Mr Green will come tomorrow?
— I’m not sure.
A.whyB.whenC.howD.whether
D

试题分析:此题考查宾语从句的引导词。Whether引导宾语从句表示是否。if或whether在引导宾语从句中作“是否”讲,常用在ask, care, wonder, know,等动词后引出带有疑问意义的宾语从句。从句语序保持陈述语序,if或whether不充当成分,只起连接作用,不可省。Why表示原因,when表示时间,how表示方式,在此处都不合适,故选D。
点评:在引导宾语从句时if和whether的用法是相同的,都表示是否。
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