题目内容：

joan spent as much time as she ___me with my english when i was studying in london.
A could help B to help C could helping D helped
答案是C,告诉我原因和翻译和不选其他的理由,谢谢

优质解答

spent+一短时间+doing sth 他花了他尽可能多的时间来帮助我