问题:
【题文】Mobile phones and electronic calculators _______ be brought in the test rooms at exam times.
A.couldn’t
B.needn’t
C.don’t have to
D.mustn’t
【题文】Mobile phones and electronic calculators _______ be brought in the test rooms at exam times.
A.couldn’t | B.needn’t |
C.don’t have to | D.mustn’t |
参考答案: