---- Was it by cutting down staff _ _she saved the firm?
---- No, it was by improving work efficiency.
A. when
B. what
C. how
D. that
网友回答
A. when
B. what
C. how
(答案→)D. that
解析：本题考查强调句型的用法，结构：It is/was +强调部分+that/who(可以指人)，看见it was 就要想到是否是强调句，把it was 和该空去掉，该句依然成立，不缺任何成分，所以该句为强调句，故答案为 D。