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