Trees ____ fight air pollution.They are natural air conditioners.
#78302
A
should
B
must
C
need
D
can
推荐题目
—Mom, I did not pass the exam.—What a pity! You it.
#62999
A
can pass
B
should have passed
C
must pass
D
must have passed
You ______ be hungry already—you had lunch only two hours ago!
#75956
A
wouldn’t
B
can’t
C
mustn’t
D
needn’t
— Guess what! I have won the first prize in the speaking competition. — Congratulations! You _____ put a lot of work into it.
#62583
A
should
B
must
C
should have
D
must have
