The young couple was worried,because neither of them was aware ______ they had lost the necklace.
#74284
A
of the place
B
of which
C
where
D
of where
推荐题目
I have two grammars, ______are of great use. 
#73806
A
all of which
B
either of which
C
both of that
D
both of which
 It was quite a serious accident, _____ caused by careless driving.
#72311
A
which I think was
B
I think which was
C
which I think it was
D
I think which it was