问题描述：
改句
The thief ran away at once when he saw the poilceman.(保持句子意思不变)
The thief ran away ____ ______ as he saw the poilceman.
A car accident happended on the highway yesterday.(保持句子意思不变)
A car accident ________ _______ on the highway yesterday.
The thief ran away at once when he saw the poilceman.(保持句子意思不变)
The thief ran away ____ ______ as he saw the poilceman.
A car accident happended on the highway yesterday.(保持句子意思不变)
A car accident ________ _______ on the highway yesterday.
问题解答：
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