I study math by ____ lots of exercises.
#49928
A
did
B
doing
C
do
D
does
推荐题目
We teachers should ______ students ______ us questions in class.
#48995
A
be allowed, to ask
B
let, to ask
C
encourage, to ask
D
allow, ask
He couldn’t help ____ .The news was so ____ .
#50819
A
smiling, excited
B
to smile, exciting
C
smiling, exciting
D
smiled, excited
---Why does Tommy look unhappy ? --- Because his teacher makes him _______ the classroom all by himself .
#50728
A
to clean
B
clean
C
cleans
D
cleaning