问题补充:
. It is only when we cannot see clearly we come to see important our eyes are.
A. that; what
B. which; what
C. that; how
D. which; how
答案:
A. that; what
B. which; what
(答案→)C. that; how
D. which; how
解析:第一空考查强调句型it is +被强调部分 + that…。第二空考查感叹句,对形容词感叹用how。句意:只有到我们失明时我们才知道眼睛有多重要。