单项选择题

The time he has devoted in the past years the disabled is now considered of great value.

A) to help; being
B) to helping; to be
C) to help ; to be
D) helping ; being

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单项选择题

Mary is always ready to help others when they are in trouble and she never ______ their requests.

A) turns up
B) turns over
C) turns in
D) turns down

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