---Listen, Mum. I heard the footsteps. Is it Dad? ---It ___ be him. He’s gone to Beijing on business this morning.
#53951
A
can’t
B
mustn’t
C
needn’t
D
shouldn’t
推荐题目
 The mountain is so high that its top       snow all the year round.
#52453
A
is covered with
B
is filled with
C
is made of
D
is used by
Don 't ask him to study too late into the night . _____ ,  he is only a small child. 
#52678
A
As a result
B
Best of all
C
After all
D
For example
—How did Kate get so much money?—She      it       her best friend.
#59745
A
borrowed; from
B
lend; for
C
borrow; to
D
lent, to