问题
Listen! Is Mary singing in the next room—No. It _______ be Mary．She has gone to Shanghai for an important meeting.
A:can’t
B:may not
C:finishing
D:needn’t;
B:may not
C:finishing
D:needn’t;
正确答案是：
同类题型
Smoking is bad for your health. You should .
_____should not be allowed to go out at night.
John plays football ______, if not better than David.
It’s always difficult to be in a foreign country, _____ if you don’t speak the language [ ]
_____you eat the correct foods _____be able to keep fit and stay healthy.[ ]