If I ______ in your place ， I wouldn ‘t trouble him.
A
本句是对现在的虚拟，所以条件状语从句用过去时。同时在虚拟语气中，一般不用was而一律用were，所以答案是A。
If you have difficulty locating a particular book ，please ask our librarians for___(assist).
电话是在1876年发明的。翻译
Thepoliceaskedthemtodescribethe________womanlookedlike.
It’s___(reasonable)to expect people to work more than 60 hours a week.
We all know about the_____ that smoking can do to our health.