Scientists are trying to         ways to treat the terrible disease called H7N9.
#53535
A
come up with
B
give in
C
talk about
D
give up
推荐题目
He tries        English and he practices       English every day.
#61045
A
to learn, speak
B
learning, speaking
C
to learn, speaking
D
learning, to speak
 Grace is a student. She _______ school every day.
#58817
A
walks
B
walks to
C
takes the foot
D
on foot
     catch the first bus to the Great Wall, we get up early.
#54610
A
In order
B
In order to
C
In order that
D
So that