19．It suddenlyoccurred（occur） to me that it might be because of the power failure．

分析 我突然想到這也許是因?yàn)橥ｋ姡?/p>

解答 答案是occurred．
本題考查語境中選用所給詞的恰當(dāng)形式；occur不及物動詞，發(fā)生，突然想到；常常用于句型"It occurred to sb．that某人突然想到…"，故答案是occurred．

點(diǎn)評 本題是要求用所給動詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的是謂語動詞還是非謂語動詞；其次，如果是謂語動詞關(guān)注時(shí)態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動詞要聯(lián)系非謂語的基本用法判斷非謂語的形式．

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