A. | Having worked | B. | Working | C. | Worked | D. | To work |
分析 科學(xué)家們對(duì)這個(gè)項(xiàng)目研究了還久了,終于做出了巨大的發(fā)現(xiàn).
解答 答案 A 根據(jù)句子可知,逗號(hào)后是句子,所以逗號(hào)前應(yīng)該使用非謂語(yǔ)動(dòng)詞,work的邏輯主語(yǔ)是scientists,是主動(dòng)關(guān)系,有時(shí)間狀語(yǔ)for a long time,應(yīng)該使用現(xiàn)在分詞的完成式,故答案為A
點(diǎn)評(píng) 本題屬于非謂語(yǔ)動(dòng)詞的考查,應(yīng)該學(xué)會(huì)先判斷語(yǔ)態(tài),根據(jù)非謂語(yǔ)動(dòng)詞與邏輯主語(yǔ)間的主被動(dòng)關(guān)系可以排除部分干擾項(xiàng);再根據(jù)時(shí)態(tài)排除部分干擾項(xiàng),從而可以得出正確選項(xiàng).
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