TThe Gushan Bridge has been finished on time the engineers' hard work.
问题描述：
TThe Gushan Bridge has been finished on time the engineers' hard work.
The Gushan Bridge has been finished on time the engineers' hard work.
A．as to B．thanks to C．except for D．but for
答
gushan大桥已经准时完工是由于工程师们的努力工作..应该选B