单项选择题

Professor Liu（）for 20 years by the end of next summer.

A. has taught
B. will be teaching
C. has been teaching
D. will have taught

<上一题 目录 下一题>
热门 试题

单项选择题
She has made it clear（）she will not take part in parties of any kind recently.

A. if
B. that
C. although
D. while
单项选择题
Never（）seen so many people cooperating in such an event.

A. is the world
B. has the world
C. the world is
D. the world has
相关试题