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

A．whyB．whenC．howD．whether

D

解析試題分析：此題考查賓語(yǔ)從句的引導(dǎo)詞。Whether引導(dǎo)賓語(yǔ)從句表示是否。if或whether在引導(dǎo)賓語(yǔ)從句中作“是否”講，常用在ask, care, wonder, know,等動(dòng)詞后引出帶有疑問(wèn)意義的賓語(yǔ)從句。從句語(yǔ)序保持陳述語(yǔ)序，if或whether不充當(dāng)成分，只起連接作用，不可省。Why表示原因，when表示時(shí)間，how表示方式，在此處都不合適，故選D。
考點(diǎn)：賓語(yǔ)從句的引導(dǎo)詞
點(diǎn)評(píng)：在引導(dǎo)賓語(yǔ)從句時(shí)if和whether的用法是相同的，都表示是否。

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