单项选择题

Accordingly, a number of other methods have been employed.

A．Therefore
B．Afterwards
C．However
D．Furthermore
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单项选择题
Up to now, the work has been easy.
A．So
B．So long
C．So that
D．So far
单项选择题
The high-speed trains can have a major impact on travel preferences.
A．force
B．influence
C．surprise
D．power
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