3．Do you doubt ______eating raw vegetables is beneficial to our physical health？（　　）
A．thatB．whether．C．ifD．which

分析 你懷疑吃生蔬菜對(duì)我們的健康有益嗎？

解答 答案為A．本題考查名詞性從句中引導(dǎo)詞的運(yùn)用．that表示"確定的信息"，在名詞性從句中不擔(dān)任成分，無(wú)意義，除賓語(yǔ)從句外，that不可省略；whether/if 表示"是否"，在從句中不擔(dān)任成分；if 一般只引導(dǎo)賓語(yǔ)從句； which 在名詞性從句中表示"選擇"，做主語(yǔ)、賓語(yǔ)或表語(yǔ)；題干中動(dòng)詞doubt后接的賓語(yǔ)從句，表示對(duì)某個(gè)"確定"的事實(shí)懷疑，從句從意思到成分都是完整的，故用that，答案是A．

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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