7．_____he will come to help us is not clear．（　�。�
A．ThatB．WhetherC．EitherD．What

分析 他是否會來幫助我們還不清楚．

解答 答案為B．本題考查名詞性從句中引導(dǎo)詞的運用．題干中is前為主語從句，空格處需要的是引導(dǎo)主語從句的引導(dǎo)詞，either不引導(dǎo)名詞性從句，故排除C；由下文中not clear判斷句中需要疑問意義的引導(dǎo)詞，that不表示疑問，故排除A；What在從句中做主語或賓語，但是本題主語從句中成分完整，所以用不擔(dān)任成分的whether表示"是否"，故選B．

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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