I study math by ____ lots of exercises.
#49928
A
did
B
doing
C
do
D
does
推荐题目
The book is very difficult. ________ read something easier?
#49670
A
Why don’t
B
Why not
C
Why you not
D
Why not you
It is a good time _______.
#49260
A
sing.
B
to sing.
C
singing.
D
sang.