一Was the doctor there when you arrived
—Yes．But he () out a moment later．

单项选择题All but one() take part in the conference()tomorrow.

A. is going to; that is to take place
B. are going to; that is about to take place
C. are going to; that is to be taken place
D. are going to; which is to be held

单项选择题The sentence needs ()

A. to improve
B. improve
C. improving
D. improved