分析 政府應(yīng)該采取一些保障措施預(yù)防有害疫苗事件再次發(fā)生.
解答 答案:be set up.
原句謂語(yǔ)動(dòng)詞用的是情態(tài)動(dòng)詞+動(dòng)詞原形,改成被動(dòng)語(yǔ)態(tài)時(shí),是含有情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài),其構(gòu)成:主語(yǔ)+情態(tài)動(dòng)詞+be+動(dòng)詞過(guò)去分詞,set的過(guò)去分詞是set,故答案為 be set up.
點(diǎn)評(píng) 將主動(dòng)語(yǔ)態(tài)改為被動(dòng)語(yǔ)態(tài)時(shí),首先觀察主動(dòng)語(yǔ)態(tài)所使用的時(shí)態(tài),然后確定相應(yīng)時(shí)態(tài)被動(dòng)語(yǔ)態(tài)的構(gòu)成,結(jié)合具體句子變可得出正確答案.
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