12．It was the first time that the childrenhad seen （see）such a big watermelon．

分析 孩子們第一次看到如此大的一個(gè)西瓜．

解答 答案是had seen．考查固定句型it was the first time++從句的結(jié)構(gòu)中，從句用過去完成時(shí)．句意是"孩子們第一次看到如此大的一個(gè)西瓜．"所以用過去完成時(shí)態(tài)had+seen．故答案是had seen．

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)語境明確句意，然后再根據(jù)相關(guān)語法對(duì)所給單詞在形式上做出正確的變動(dòng)．

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