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。