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
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单项选择题
A．believableB．useableC．practicalD．available
A．believable
B．useable
C．practical
D．available
单项选择题
The football player had studied economics in the university for ______ of roughly six years.
A．a decade
B．a time
C．an age
D．a period
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