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题型：单选题题类：模拟题难易度：普通

- Have you known each other for long?
- Not very long, _______ we started to work in the company.

A、after B、since C、when D、before

举一反三

I am going to Tian'anmen Square to watch the raising of the national flag with Lin Tao it rains early tomorrow morning.

I was watching a TV play ______ a friend came into my room.

He is only a child, he knows a lot.

She is uncertain about ______ she can get a good job even though she's a top student in her school.

—Ling ling, you'll feel sleepy tomorrow _______ you go to bed early.

—OK, Mom. I'll go to bed at once.

_______ he exercises every day, _______ he is very healthy.

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