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

正确答案是：

同类题型

Why does the lake smell terrible?—Because large quantities of water______

When we write our homework on the computer, we should _____ first.

Have we ____ water —Yes,_____. We’d better get some.

I ______ in Hangzhou for many years, but now I live in Beijing

_____ a smile on his face, he came into the classroom.