A. | was invented | B. | invented | C. | has invented |
分析 青蒿素是中國(guó)偉大科學(xué)家屠呦呦發(fā)明的.
解答 答案:A
結(jié)合語(yǔ)境可知屠呦呦發(fā)明青蒿素描述的是過(guò)去發(fā)生的事情故確定時(shí)態(tài)為一般過(guò)去時(shí),主語(yǔ)Artemisinin是謂語(yǔ)動(dòng)詞invent的承受者,二者為被動(dòng)關(guān)系所以用被動(dòng)語(yǔ)態(tài),故該空處為一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài),其結(jié)構(gòu)為:主語(yǔ)+was/were+及物動(dòng)詞的過(guò)去分詞,主語(yǔ) Artemisinin是單數(shù)名詞,be動(dòng)詞用was,invent的過(guò)去分詞是invented,套用結(jié)構(gòu),故選A
點(diǎn)評(píng) 本題考查時(shí)態(tài)和語(yǔ)態(tài).每個(gè)時(shí)態(tài)都有標(biāo)志詞,熟記這些標(biāo)志詞是做題的關(guān)鍵.在沒(méi)有時(shí)間狀語(yǔ)的情況下可以根據(jù)語(yǔ)境來(lái)對(duì)時(shí)態(tài)做出判斷.判斷語(yǔ)態(tài)的關(guān)鍵則是觀察主語(yǔ)是謂語(yǔ)動(dòng)詞的執(zhí)行者還是承受者,二者結(jié)合套用結(jié)構(gòu)即可選出正確答案.
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