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
Our school singing group is going to give ______ performance next month; don't miss it.
A．an alive
B．a living
C．a live
D．a life
单项选择题
The energy gained-from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.
A．precede
B．proceed
C．progress
D．practice
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