What can we students do _____ the environment?
#50177
A
to protect
B
protected
C
protecting
D
protects
推荐题目
— He is working hard now.— He tries ___ English. So he practices ___ English every day.
#49653
A
to learn, to speak
B
learning, speak
C
to learn, speaking
D
learning, to speak
—I have no idea ____________ tell her the bad news. —I think tomorrow is the best time.
#48644
A
how to
B
when to
C
how can I
D
when can I