Question

A person__a foreign language must be able to use the foreign language,__all about his own

A) to learn,to forget B)learning,to forget C)to learn ,forgeting D)learning,forgeting谢谢

Answer 1

答案B
learning是后面是个省略的定语从句，其实整句话是"a person who is learning a foreigh language...“
第二个横线是接be able to...其后面接不定式to use,自然，第二个横线后的all about是承接be able to的动词不定式，因此是to forget...

Answer 2

D)learning,forgeting

Answer 3

应该选C吧