It was said was how the Chinese first raised silk worms.
#72116
A
that what
B
that which
C
that who
D
that that
推荐题目
I want to buy a piano of high quality, _____ I can practise on every afternoon.
#73474
A
that
B
so that
C
what
D
one
Following the girl, we went into a hall, on ____ walls hung a few pictures of some famous scientists．
#70172
A
its
B
which
C
whose
D
those
_________ team wins on Saturday will go through to the national championships．
#68662
A
No mater what
B
No matter which
C
Whatever
D
Whichever