When you goacrossthe street.you must be careful．题目和参考答案——青夏教育精英家教网—

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19．When you goacross（cross）the street，you must be careful．

分析当你过马路时，一定要小心．

解答答案：across．
根据When you go--（cross）the street，you must be careful，可知当你过马路时，一定要小心．这里go是个动词，后面应该用介词across表示穿过．故填across．

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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