--Who has opened the door?  ---I think it __ be Lin Tao. He’s always the first to get here.
#88947
A
is able to
B
can't
C
must
D
mustn’t
推荐题目
 If I had been a little more careful, I _______the wallet behind.
#86676
A
won't leave
B
hadn't left
C
didn't leave
D
wouldn't have left
—It was a red light, William. You ____ the car. —Sorry.  I didn’t see it. 
#87773
A
must stop
B
should stop
C
must have stopped
D
should have stopped