She was working ( ) her office

问题描述:

She was working ( ) her office
( )中应添
A.inot
B.at
C.over

应用于"office"这种小型地点应该用介词"at".而"into"是用以修饰动词的,"over"是不能表示"在...地方"的,符合句子的答案只有B.