昨天我去拜访了他。
I called on him to keep his promise.
我要求他遵守诺言。
I called on him, he was busy with his work.
每次我去见他，他都忙着工作。
I called on him yesterday, but he could not help us.
我昨天去拜访他了，但他帮不了我们的忙。
Each time I called on him, he was busy with his work.
每次我去拜访他，他总是在忙着工作。
Unfortunately Tom was going out when I called on him at his house.
我到汤姆家拜访时，很不巧他正要外出。
Unfortunately Tom was going out when I called on him at his house.
我到汤姆家拜访时，很不巧他正要外出。
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