单项选择题

He appeared to be talking to himself.

A. seemed
B. loved
C. preferred
D. used
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单项选择题
I turned down his invitation to the party since I had to finish my homework that night.
A. declined
B. sent
C. accepted
D. received
单项选择题
A great deal has been done to remedy the situation.
A. maintain
B. improve
C. assess
D. protect
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