---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
When a pencil is partly in a glass of water, it looks as if it ______.
#90526
A
breaks
B
has broken
C
were broken
D
had been broken
The mother insisted her child ________________________.
#87244
A
to be checked
B
on having a check
C
be checked
D
should check