问题补充：
All school buses in the northwestern provinceswith satellite positioning devices next year.
A. fitted
B. will be fitted
C. have been fitted
D. are fitted
答案：
A. fitted
(答案→)B. will be fitted
C. have been fitted
D. are fitted
解析：考查时态。根据后面的next year可知是将来时。句意：明年所有西北地区的校车将会被装备卫星定位装置。
