16．________ he will come here isn't clear．（　�。�
A．IfB．WhetherC．WhereD．What

分析 他是否會來這里還不清楚．

解答 答案是B．本題考查主語從句中的引導(dǎo)詞；題干中isn't前是主語從句中；if 不引導(dǎo)主語從句放在句首，故排除A；從句中有了地點(diǎn)here，故排除C；what在名詞性從句中可做主語、賓語、表語或定語，本題主語從句成分完整，排除D；whether表示"是否"，可以引導(dǎo)各種名詞性從句，在從句中不擔(dān)任成分；根據(jù)句意，他"是否"會來還不清楚，答案是B．

點(diǎn)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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