15．I've come to learn that the best time to debate with family members is               they have food in their mouths．（　　）
A．howB．whenC．whetherD．that

分析 我已經(jīng)認(rèn)識(shí)到與家庭成員辯論的最佳時(shí)間是他們嘴里在吃東西的時(shí)候．

解答 答案是B．
本題考查表語(yǔ)從句中的引導(dǎo)詞；題干中is后面的表語(yǔ)從句；how 表示方式"如何"；when表示"時(shí)間"； whether是否；that在名詞性從句中不擔(dān)任成分、無(wú)意義；根據(jù)上文the best time和句意可知，最佳時(shí)間是家人在吃東西的"時(shí)候"，故答案是B．

點(diǎn)評(píng) 名詞性從句考查的關(guān)鍵是連接詞的選用和語(yǔ)序，因此，我們首先要搞清從句的性質(zhì)，掌握各連接詞的用法，在此基礎(chǔ)上判斷．此外，關(guān)注名詞性從句用陳述語(yǔ)序．

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科目：高中英語(yǔ) 來(lái)源： 題型：閱讀理解

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