If I had had time, I would have written to you. But in fact I ________ not.
A.have
B.would have had
C. had
D. had had
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Yesterday I ________ (think) that you were not in Beijing.
Alice usually ________ (sit) in the front of the classroom, but she ________ (sit) at the back this morning
He ________ (tell) the news to us three days ago
He________ (begin) to teach Chinese in 1990.
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