Look at the trouble I am in. If only I your advice then.A. followed　B. would followC. had

问题补充：

Look at the trouble I am in. If only I your advice then.

A. followed

B. would follow

C. had followed

D. should follow

答案：

A. followed

B. would follow

(答案→)C. had followed

D. should follow

解析：考查虚拟语气。If only要是。。。就好了，后面用虚拟语气。根据then可知指的是过去的情况，要用过去完成时。选C。