【单选题】
There are some navigational instruments（）the bridge.
A、in
B、on
C、at
D、of
查看正确答案
A、A. There are some saws in my toolbox. B、B. There are some pairs of pliers in my toolbox. C、C. There are some spanners in my toolbox. D、D. There are some tools in my toolbox.
