单项选择题

He has ______ over a seminar for social psychologists.

A. subscribed
B. tangled
C. refrained
D. presided
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单项选择题
While being questioned on the court, the man denied ______ tile guy.
A. having murdered
B. murdering
C. to have murdered
D. to murder
单项选择题
We will be losing money this year unless that new economic plan of yours ______ miracle.
A. is working
B. works
C. will be working
D. worked
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