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— Do you know ____ Mr Green will come tomorrow?
— I’m not sure.

A．why

B．when

C．how

D．whether

解析試題分析：此題考查賓語從句的引導詞。Whether引導賓語從句表示是否。if或whether在引導賓語從句中作“是否”講，常用在ask, care, wonder, know,等動詞后引出帶有疑問意義的賓語從句。從句語序保持陳述語序，if或whether不充當成分，只起連接作用，不可省。Why表示原因，when表示時間，how表示方式，在此處都不合適，故選D。
考點：賓語從句的引導詞
點評：在引導賓語從句時if和whether的用法是相同的，都表示是否。

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