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)詞的運用．that表示"確定的信息"，在名詞性從句中不擔(dān)任成分，無意義，除賓語從句外，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)賓語從句； which 在名詞性從句中表示"選擇"，做主語、賓語或表語；題干中動詞doubt后接的賓語從句，表示對某個"確定"的事實懷疑，從句從意思到成分都是完整的，故用that，答案是A．

點評 名詞性從句考查的關(guān)鍵是連接詞的選用和語序，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序．

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