1. At that time, he spent as much time as he can ____ the ancient status which would be sank in the river.
A. paint B. to paint C. painting D. painted
变式1. We will do everything we could _____ the endangered animals.
A. to protect B. protect C. protected D. protecting
解析：1.spend as much time/money as one can doing sth. “花尽可能多的时间或金钱来做某事。”答案：C
变式1. do everything one could to do “尽力去做某事”答案：A
