17．Jack is said _____ abroad for three years，but I didn't know about it．（　　）
A．studyingB．to have studiedC．having studiedD．to study

分析 據(jù)說杰克去國(guó)外學(xué)習(xí)了三年，但我還不知道這事．

解答 答案：B．根據(jù) sb．be said to do sth．意思是：據(jù)說某人干了某事，從選擇之來看，說明只能在B，D 中選擇．而且后面有一個(gè)短語(yǔ)for three years，說明學(xué)習(xí)這個(gè)動(dòng)作已經(jīng)發(fā)生．可知，B是正確答案．

點(diǎn)評(píng) 這是考查非謂語(yǔ)中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；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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