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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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
单项选择题
He appeared to be talking to himself.
A. seemed
B. loved
C. preferred
D. used
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