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
Can you follow the plot so far
A．change
B．investigate
C．write
D．understand
单项选择题
Even in a highly modernized country, manual work is still needed.
A．physical
B．mental
C．natural
D．hard
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