Marcia can't speak German yet,but after a few lessons she.speak a little.

问题描述:

Marcia can't speak German yet,but after a few lessons she.speak a little.
A.can B.could C.is able to D.will be able to
请帮我选正确答案以及原因

C :is able to+原形 表示能够做某事,在一定程度上,而 can + 原形表示很大程度上可以做