1．Coal has beenreplaced（代替） by gas in some big cities．

分析 在一些大城市里，煤炭已經(jīng)被天然氣所代替了．

解答 答案：replaced
由于句中的謂語(yǔ)部分符合"has/have+been+done"的結(jié)構(gòu)，故此處考查的應(yīng)是現(xiàn)在完成時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)；結(jié)合句中給出的漢語(yǔ)部分可知，這里應(yīng)填動(dòng)詞replace的過(guò)去分詞形式；故答案為：replaced

點(diǎn)評(píng) 本題考查了單詞拼寫．做本題時(shí)，首先結(jié)合題干中給出的漢語(yǔ)意思，然后從語(yǔ)法分析的角度去判斷句中所填單詞的形式；另外，在平時(shí)的學(xué)習(xí)中，需要積累一定的詞匯量，牢固記憶單詞的拼寫，并且熟練掌握各類詞法，句法等語(yǔ)法知識(shí)．

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