单项选择题

He ______ for her for one hour by the time she arrived there.

A．has been waiting
B．has waited
C．had been waiting
D．waited
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单项选择题
Which of the following is true according to the passage
A．Sections of economy do not influence each other.
B．In the expansion phase the business maintains development in the long run.
C．The end of the business in the prosperity period can be obviously seen.
D．Parts of economy are closely related to each other.
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