--Listen! Someone is knocking at the door.-- ______ be Mary. She has just been to Beijing
#89781
A
She mustn’t
B
It can’t
C
It must
D
She may
推荐题目
She___ taller, but she ate too little.
#87423
A
can grow
B
can have grown
C
could grow
D
could have grown
Our English teacher requested that the homework ________ tomorrow.
#87294
A
would be handed in
B
hand in
C
be handed in
D
must be handed in
 I should not have laughed if I ______ you were serious.
#86869
A
thought
B
would think
C
had thought
D
have thought