5. Once      ，water will become gas. (heat)

一旦加熱到足夠高的溫度，水會變成氣體。

5. (it is) heated to a high enough temperature考查once 引導(dǎo)的狀語從句的運(yùn)用。once從句為條件狀語從句，從句謂語動(dòng)詞只能用一般時(shí)代替相應(yīng)的將來時(shí)，且當(dāng)從句中謂語動(dòng)詞含be而主語與主句相同時(shí)，從句中的主語和be都可省略。具有類似用法的結(jié)構(gòu)還包括when,while,before,after,if, unless,though等引導(dǎo)的狀語從句。 

題目來源：高考丟分題英語 > Unit 3 Travel journal

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