I know he spends as much time reading books as_________.
A、exercises
B、doing exercises
C、do exercises
D、does exercises
【正确答案】：B
【题目解析】： 本题考查省略。spend time on sth/(in) doing sth). 该句省略了he does，he does指he spends time，为避免重复换成了does. 英语要尽量避免重复。如果不省略，则是I know he spends as much time reading books as he does doing exercises.
