---Look at these tracks. It _____ be a wolf.” ---Don’t be so sure. I think it _____ be a fox.
#87712
A
must; could
B
may; might
C
need; must
D
could; need
推荐题目
The board considered it urgent that those files _____ right away.
#86957
A
be printed
B
will be printed
C
must be printed
D
had to be printed
—Where ____ Margaret have put the empty bottles?—She ______ them away. They must be somewhere.
#89520
A
can; can’t have thrown
B
must; needn’t
C
must; must have thrown
D
can; must throw
—Do you know where the headmaster is? I have something urgent. —Oh, he ____ have gone far, for the computer is still on in the office.
#87887
A
won’t
B
mustn’t
C
can’t
D
wouldn’t
How I wish I _____ history when I was in university.
#86921
A
study
B
studied
C
would study
D
had studied