单项选择题

Up to now, the work has been easy.

A．So
B．So long
C．So that
D．So far
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单项选择题
He talks tough but has a tender heart.
A．heavy
B．strong
C．kind
D．wild
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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