–Look! The boy is running fast! –He might ______ to catch a bus.
#75241
A
run
B
running
C
is running
D
be running
推荐题目
 “Not having returned home yet, _________”, his father said to the police.
#63543
A
his mother got worried
B
his mother must be worried
C
I think he is missing
D
he must have got into some trouble.
—Must I take out the trash?—No,  you ________.
#75794
A
need
B
needn’t
C
couldn’t
D
shouldn’t
—May I swim here?  — No, you _______.  It is dangerous.
#62690
A
won’t
B
needn’t
C
mustn’t
D
don’t have to