1．The policeman warned the drive ________ so carelessly.
A. never to drive B. to never drive
C. to not drive D. doesn’t drive
2. I ‘d like to know ______Chinese.
A. when he began to learn B. when did he begin to learn
C. when did he begin learning D .for how long he began to learn.
3. It is the first time that I ______the Great Wall.
A. visit B. visited C. have visited D. had visited
