C 这个计划是否会给公司带来利润尚属未知.
AD意思不对
选whether为避免歧义
具体见以下if 和whether的用法区别
if和whether的区别：
1 在动词不定式之前只能用whether .
2 在whether …… or not 的固定搭配中.
3 在介词后,只能用whether.
4宾语从句放在句首表示强调时,只能用whether .
5用if会引起歧义时,只用whether.如用whether可避免歧义
[8] It remains doubtful ______ the project to be accomplishe
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