Question

      you may have , you should gather your courage to face the challenge .

A．However serious a problem

B．Whatever serious a problem

C．However a serious problem

D．No matter how a serious

Answer 1

A

试题分析：考查让步状语从句。因为后面直接接了形容词serious，说明前面使用how；因为what后面接名词或者名词短语。句意：无论你遇见如何严重的问题，你都应该鼓起勇气面对挑战。故A正确。
点评：however后面接形容词或者副词；whatever后面接名词或者名词短语；这些都可以用来引导让不状语从句。