many times but she still didn't know how to do it.A. She was taughtB. Having taughtC. Ha

问题补充：

many times, but she still didn know how to do it.

A. She was taught

B. Having taught

C. Having been taught

D. She has taught

答案：

(答案→)A. She was taught

B. Having taught

C. Having been taught

D. She has taught

解析：因为有but连接所以前后两个必须是完整的句子。