单项选择题

No one doubts ______ he is the best leader in the company.

A．whether
B．if
C．what
D．that
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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 on
D．hang onto
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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