请教if和whether的区别

Zingales

34. Beyond the immediate cash flow crisis that the

museum faces, its survival depends on if it can

broaden its membership and leave its cramped

quarters for a site where it can store and exhibit its

more than 12,000 artifacts.

(A) if it can broaden its membership and leave

(B) whether it can broaden its membership

and leave

(C) whether or not it has the capability to broaden

its membership and can leave

(D) its ability for broadening its membership

and leaving

(E) the ability for it to broaden its membership

and leave
正确答案B没问题，但是我想请问各位NN，什么时候用if，什么时候用whether，有什么说法吗

echodancing

是的，因为GMAC认为在宾语从句中用if有歧义

比如 i do not know if he has finished the job
可以理解成：我不知道他是否完成了工作
还可以理解成： 如果他完成了工作，我就不知道

sherilynchi

只有WHETHER可以表示是否，IF不可以

Zingales

了解了，谢啦

wltcharlotte

if 可用在假设，让步的情况
whether可以用在让步的情况。
在if和whether表示让步的意义时，只有whether引导的从句可以做宾语，也

就是这道题要选B的原因