The key      the earth is to change the way      we live.
#96487
A
to save; /
B
to saving; /
C
to save; how
D
to saving; how
推荐题目
I can’t pretend ________ happy when I am not.
#88649
A
to be
B
to have been
C
being
D
having been
To be admitted to a key university, _______.
#93091
A
our parents always impress on us the importance of hard work
B
some universities attach great importance to students’ grades
C
all the students in senior 3 are making every effort to study hard
D
good grades are quite necessary