问题

Listen!Helen issinging in the next room.—It _____be Helen .She has gone to Beijing.
A:should 应该
B:mustn’t 禁止
C:may可能
D:can’t
B:mustn’t 禁止
C:may可能
D:can’t
正确答案是:
同类题型
I ____ my pen on the table, so I can’t write down his telephone number.
______ his timely help, Kate overcame the hardship at last
Why does the lake smell terrible?—Because large quantities of water_______________
Oh, boy, why are you killing yourtime this way? Can’t you find something _____ doing? [ ]
Here are some Christmas presents, ____you can choose one for yourself.