__,if he doesn't learn he knows nothing. A.be a man ever so clever B.A man is ever so clever

Question

__,if he doesn't learn he knows nothing. A.be a man ever so clever B.A man is ever so clever C.So clever as a man ever is D.NO matter how clever be 这题为什么选A，为什么C是错的呢

Answer 1

这是一个复合句，if引导的是条件状语从句，所以选项必须是一个完整的主句。而选项C不是一个完整的句子，所以不能选C。选项A是一个祈使句。