单项选择题

It is necessary that an efficient worker______his work on time.

A．accomplishes
B．can accomplish
C．accomplish
D．has accomplished
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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
The machine needs a complete______since it has been in use for over ten years.
A．amending
B．fitting
C．mending
D．renovating
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