Smoking, _______ is a bad habit, is, however, popular. 
#73804
A
that
B
which
C
it
D
though
推荐题目
 He made another wonderful discovery, ____ of great importance to science.
#69957
A
which I think is
B
which I think it is
C
which I think it
D
I think which is
It _____ ten years since they _____ to France.
#41050
A
was; moved
B
was; have moved
C
is; have moved
D
is; moved