合并下列句子
1.He dropped a coin.He walk across the street(when)
2.He boiled the wather.He drank the water(before)
人气：131 ℃ 时间：2020-09-05 16:36:08
解答
1.He dropped a coin when he walked across the street.He dropped a coin when walking across the street.2.He boiled the water before he drank it.He boiled the water before drinking it.
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