1、Two fifths of the police _____ in the school near the town.
A. has trained B. have trained C. has been trained D. have been trained
2、We would like to go and thank him ourselves, but we _____ out his address yet.
A. haven’t found B. hadn’t found C. didn’t find D. don’t find
3、Was it because it snowed last night ____ he didn’t come?
A. why B. that C. when D. then
