题目内容
12．Hedropped （drop） his wallet on the ground when he crossed the street．分析 他过马路时把钱包掉在地上了．
解答 答案：dropped 考查单词填空．根据题干：crossed 是过去式，前面的时态是也要用一般过去时，drop要用过去式 dropped
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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