--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
After a heated discussion, we suggested the customer _______ the product back for repairs.
#87785
A
to send
B
send
C
sends
D
sent
---- The woman biologist stayed in Africa studying wild animals for 13 years before she returned.---- Oh, dear! She _______ a lot of difficulties!
#89850
A
may go through
B
might go through
C
ought to have gone through
D
must have gone through
He is an hour late by now．He last night．
#87971
A
must stay up
B
should stay up
C
must have stayed up
D
should have stayed up