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(shuō)在過(guò)去幾個(gè)月期間，埃博拉對(duì)人類來(lái)說(shuō)已經(jīng)成了另一個(gè)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(shuō)要干某事．所以排除A，C．再根據(jù)句末的時(shí)間狀語(yǔ)over the past several months，故這里的不定式用完成式，表示已經(jīng)成為．

點(diǎn)評(píng) 此題考查非謂語(yǔ)動(dòng)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(shí)：to do 表目的、將來(lái)；doing 表主動(dòng)、伴隨；done表被動(dòng)、完成．同時(shí)答題步驟為：1．判斷是否為非謂語(yǔ)動(dòng)詞，看是否有連詞．2．找邏輯主語(yǔ)．3．判斷邏輯主語(yǔ)與非謂語(yǔ)動(dòng)詞的關(guān)系．4．看是否非謂語(yǔ)動(dòng)詞動(dòng)作發(fā)生在主句謂語(yǔ)動(dòng)作之前，如果是之前，就用完成式的形式．

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