The professor paused as if his students to ask questions on the point he had just made.A

问题补充：

The professor paused as if his students to ask questions on the point he had just made.

A. expecting

B. is expecting

C. expected

D. to have expected

答案：

(答案→)A. expecting

B. is expecting

C. expected

D. to have expected

解析：考查时态。句意：这位教授暂停了一下，好像正盼望着他的学生回答他刚才提出的问题。结合语境可知从句中描写的是刚才发生的动作，故用过去进行时态，这句话省略了he was，选A。