问题补充：
－Who are you waiting for?
－ us a lecture this afternoon.
A. The professor wants to give
B. The professor will give
C. The professor about to give
D. The professor to give
答案：
A. The professor wants to give
B. The professor will give
C. The professor about to give
(答案→)D. The professor to give
解析：考查不定式作后置定语。句意：--你在等谁？--（我在等）今天下午给我们作演讲的那个教授。A、B语法上没错，但意思不对，“那个教授想给我们作演讲”；“那个教授将要给我们作演讲”，都不是对问句的正确回答，属于答非所问，排除A、B；be about to do sth将要做某事，排除C。动词不定式to give作the professor的后置定语。故选D。
