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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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
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A．believable
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The football player had studied economics in the university for ______ of roughly six years.
A．a decade
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