Question

I know one of the things _____I was unsure about was _____ hard it would be to climb   this mountain.

A．that; how

B．what; how

C．which; what

D．/; what

Answer 1

A

试题分析：考查定语从句和感叹句：句意：我知道我不能确定的一件事情是爬这座山会多难。第一空是that引导的定语从句，先行词是one of the things，定语从句中缺少宾语，用that，which或是省略关系代词，但是第二空后面hard 是形容词，用 how 修饰，what 修饰名词，这句话是表语从句，如果不是感叹句应该是 It would be hard to climb this mountain。对 hard 强调用 how，选A。