I was out of town at the time，so I don’t know exactly how it ________.
| A．was happening | B．happened |
| C．happens | D．has happened |
相关试题
It’s well-known that ________ World Exposition in 2010 is quite ________success.
A. 不填; a B. The; a 
The; 不填 D. 不填; the
—We’ve missed the train!
—________, there will be another in ten minutes.
A. I’m sorry B. Excuse me 
I beg your pardon D. Never mind
The audience was _____ very young children so there was a lot of noise while the concert was going on.
| A．made up from | B．made up for | C．made up into | D．made up of |
The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.
| A．that | B．it | C．this | D．him |
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