单项选择题

I'm very glad to know that my boss has generously agreed to______my debt in return for certain services.

A．take away
B．cut out
C．write off
D．clear up
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单项选择题
A thorough study of biology requires______with the properties of trees and plants, and the habit of birds and beasts.
A．acquisition
B．discrimination
C．curiosity
D．familiarity
单项选择题
He offered to______her a hand as the suitcase was too heavy for her to carry.
A．help
B．show
C．lend
D．borrow
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