单项选择题

The accident ______ downtown yesterday resulted from the driver's carelessness.

A．happening
B．happened
C．which had happened
D．which happened
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单项选择题
I regret ______ you that I can't go to Hangzhou for a visit next Sunday with you, because I've caught a bad cold.
A．to tell
B．telling
C．tell
D．having told
单项选择题
A．believableB．useableC．practicalD．available
A．believable
B．useable
C．practical
D．available
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