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用 before/after + -ing 形式造句
They did the shopping. Then they went home.
After the shopping, they went home.
John left school. Then he worked in a bookshop for two years.
John worked for two years after .
I read for a few minutes. Then I went to sleep.
Before , I .
We walked for three hours. We were very tired.
After , .
Let’s have a cup of coffee. Then we’ll go out.