根据材料不同，垂直防渗墙主要有黏土防渗墙、（）、土工膜防渗墙等。
A.混凝土防渗墙
B.堆石墙
C.砖石墙
D.土墙
参考答案：A
—Will you go to the Net bar with me?
—Sorry. My mother always tells me _______ there. [ ]
A. not go
B. not to go
C. don't go
D. didn't go
