问题描述:
根据以下两个英文句子说说when从句什么时候用ing形式
1.He met Lily when he was travelling in New York .
2.She was sweeping the floor when you phoned her this morning .
1.He met Lily when he was travelling in New York .
2.She was sweeping the floor when you phoned her this morning .
问题解答:
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