18．EBOLA（埃博拉）is said_______ another big health challenge to humans over the past several months．（　�。�
A．becomingB．to becomeC．having becomeD．to have become

分析 句意：據(jù)說在過去幾個月期間，埃博拉對人類來說已經(jīng)成了另一個大的健康挑戰(zhàn)．

解答 答案：D．根據(jù)be said to do sth．意思是：據(jù)說要干某事．所以排除A，C．再根據(jù)句末的時間狀語over the past several months，故這里的不定式用完成式，表示已經(jīng)成為．

點評 此題考查非謂語動詞中的不定式的完成式的用法，同學(xué)們應(yīng)該把握好以下的知識：to do 表目的、將來；doing 表主動、伴隨；done表被動、完成．同時答題步驟為：1．判斷是否為非謂語動詞，看是否有連詞．2．找邏輯主語．3．判斷邏輯主語與非謂語動詞的關(guān)系．4．看是否非謂語動詞動作發(fā)生在主句謂語動作之前，如果是之前，就用完成式的形式．

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