20．It is not clear ___________ the newly-elected president will do to solve the tricky problem．（　�。�
A．whatB．whetherC．whichD．how

分析 還不清楚新當(dāng)選的總統(tǒng)會采取什么措施解決這個棘手的問題．

解答 答案為A．本題考查名詞性從句中引導(dǎo)詞的運用．題干中it為形式主語，逗號后面的主語從句中缺少的是及物動詞do的賓語；what在名詞性從句中可做主語、賓語、表語或定語，表示"所、什么"；故答案是A．whether在名詞性從句中不擔(dān)任成分；which表示選擇；how不做賓語，故排除B、C和D．

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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