——Who       it be that is knocking at the door?——It       be Father, but I’m not sure. 
#85013
A
can; must
B
can; may
C
must; can
D
may; must
推荐题目
_________ you met with such a strange man yesterday?
#85194
A
Where it was that
B
Who it was that
C
Where was it that
D
Where was that
It was the training      he had as a young man     made him such a good engineer.
#85237
A
what; that
B
which; that
C
that; which
D
that; what