The factory was built in a secret place, around _________ high mountains. 
#73444
A
which was
B
it was
C
which were
D
them were
推荐题目
The expert offered us another piece of advice,_____of great help to our program. 
#73723
A
I think it is
B
I think which is
C
which I think it is
D
which I think is 
The doctor ______ she sent her friend is very famous.
#70778
A
to whom
B
to whose
C
whom
D
at whom
The old man has a son and two daughters, ______ treating him well, ______ makes him sad.
#70326
A
none of them; which
B
and none of whom; that
C
none of whom; which
D
and none of them; that