The main cause of HIV / AIDS infection in China is drug abuse,  ______ is very serious in Yunnan.
#4983
A
what
B
who
C
that
D
which
推荐题目
It is the second time you _________ such a mistake.
#4524
A
will make
B
have made
C
made
D
had made
We must keep our room clean, for dirt and disease go______, you know.
#4919
A
hand in hand
B
step by step
C
from time ti time
D
one zfter another