主讲教师：张志强 北京市特级英语教师
题一：When I saw Mary, she ______ the piano.
A. is playing B. plays C. was playing D. played
题二：---Is there anything wrong, Bob? You look sad.
---Oh, nothing much. In fact, I ______ of my friends back home.
A. have just thought B. was just thinking C. would just think D. will just be thinking
题三：Teenagers ______ their health because they play computer games too much.
A. have damaged B. are damaging C. damaged D. will damage
题四：We have to put off the sports meeting because it _______ so hard.
A. is raining B. rains C. are raining D. is rained
