19．It musthave rained（rain） last night，for the ground is very wet．

分析 昨天晚上肯定下雨了，因?yàn)榈厣鲜浅钡模?/p>

解答 答案是have rained．本題考查語(yǔ)境中選用所給詞的適當(dāng)形式．must have done肯定已經(jīng)…，表示對(duì)過(guò)去的或已經(jīng)發(fā)生的事的肯定推測(cè)；根據(jù)語(yǔ)境，題干中推測(cè)"昨晚肯定下雨了"，故答案是have rained．

點(diǎn)評(píng) 本題是要求用所給詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的詞性；其次，如果是謂語(yǔ)動(dòng)詞關(guān)注時(shí)態(tài)、語(yǔ)態(tài)和數(shù)的變化；如果是非謂語(yǔ)動(dòng)詞要聯(lián)系非謂語(yǔ)的基本用法判斷非謂語(yǔ)的形式；如果是名詞關(guān)注單復(fù)數(shù)．

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