call in/call on/call off

1. 拜訪

I shall call on you next week.

我下星期去看你。

2. 號召;請求

You'd better call on your friends to help you.

你最好請朋友來幫你。

2,call in

1. 請求收回;請來

3,call off

1. 取消

Why was the football match called off?

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