问题
选择题
Nowadavs,most people,in order to keep fit,prefer walking to driving _________necessary.
A．if
B．unless
C．in case
D．as if
答案
答案：B
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Nowadavs,most people,in order to keep fit,prefer walking to driving _________necessary.
A．if
B．unless
C．in case
D．as if
答案：B