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
It is self-evident that he will win the game.
A．likely
B．possible
C．clear
D．probable
单项选择题
Fog can be a hazard on the motorways in winter.
A．protection
B．indication
C．immunity
D．danger
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