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
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A great deal has been done to remedy the situation.
A. maintain
B. improve
C. assess
D. protect
单项选择题
They are concerned for the fate of the forest and the Indians who dwell in it.
A. live
B. sleep
C. hide
D. gather
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