______ is known to us is that tobacco co
题型:选择题
问题:
______ is known to us is that tobacco contains nicotine and other harmful products, so you should
give up smoking.?[ ]
A. As
B. It
C. What
D. Which
______ is known to us is that tobacco contains nicotine and other harmful products, so you should
give up smoking.?[ ]
A. As
B. It
C. What
D. Which