2022吉林统招专升本英语每日一题93

13. No matter ________ difficult the problem is, he will solve it.

A.what B.whatever C.how D.however

13.【题目】C。二阶：句意：不管这个关键问题有多难，他都尽力去解决。根据what+n，how+adj，可排除预设A和B。however=no matter how不管多么。故选C。