After I _______ for an hour, I realized that he was not coming.
A. was waiting
B. had been waiting
C. waited
D. have waited
查看答案
Scientists concluded that smoking ______ harmful to a person’s health.
A. is
B. be
C. being
D. was
That was the fifth time that he ______ about that touching film in a month.
A. had talked
B. have talked
C. talked
D. was talking
The nurse ______ on a night shift for several weeks.
A. is working
B. works
C. worked
D. has been working
We’d better go out tomorrow because Susan ______ the violin all day.
A. will be practiced
B. will be practicing
C. practices
D. would be practiced
微信支付 
支付宝支付