问题

Liu Fang is a company CEO now, but she ____ as a teacher in a middle school for three years

A:worked
B:has worked
C:works
D:had worked

正确答案是：

同类题型

We can’t take part in the competition ________ we get our student card.

Look at the math book. Do you know ______ it might be

Studying in groups is necessary_____ you want to do well in school

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