问题
选择题
. 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
答案：C
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。