—This wall of air is an effective answer
题型:选择题
问题:
—This wall of air is an effective answer to the problem and it ____ work.
—But it is a question to put such a wall of air around the statue.
A.may
B.must
C.should
D.could
—This wall of air is an effective answer to the problem and it ____ work.
—But it is a question to put such a wall of air around the statue.
A.may
B.must
C.should
D.could