20．The doctors areoperating （operate） on the patient now．

分析 現(xiàn)在醫(yī)生們正在給病人做手術(shù)．

解答 答案：operating
根據(jù)該空處在句中作謂語(yǔ)故填入所給動(dòng)詞operate的正確形式，根據(jù)句中的時(shí)間狀語(yǔ)now可確定為現(xiàn)在進(jìn)行時(shí)態(tài)，其結(jié)構(gòu)為is/am/are+現(xiàn)在分詞，根據(jù)空格前已有助動(dòng)詞are，故直接填入operate的現(xiàn)在分詞即可，故答案為operating

點(diǎn)評(píng) 本題考查用所給單詞的適當(dāng)形式填空，首先要根據(jù)語(yǔ)境明確句意，然后再根據(jù)相關(guān)語(yǔ)法對(duì)所給單詞在形式上做出正確的變化．

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