单项选择题

The plan indicated that this objective was ______ in the following way.

A．attaining
B．to be attained
C．to attain
D．attained
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单项选择题
Good lighting in factories leads to greater comfort, higher ______ and productivity, fewer mistakes and accidents.
A．achievement
B．proficiency
C．craft
D．efficiency
单项选择题
It is not easy to learn English well but if you ______ , you will succeed in the end.
A．hang up
B．hang about
C．hang onto
D．hang on
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