But for electricity, human life ________ so easy today.
But for electricity, human life ________ so easy today.
A.isn't
B.will not be
C.would not have been
D.would not be
答案及解析: D
But for electricity, human life ________ so easy today.
A.isn't
B.will not be
C.would not have been
D.would not be
答案及解析: D