Choose the underlined part among A, B, C or D that needs correcting

IV. Choose the underlined part among A, B, C or D that needs correcting.

1. Lan used to having long hair when she was young.

A B C D

2. He has taught English in this school for 2009.

A B C D

3. One of the most urgent problem facing us now is the need to control population growth.

A B C D

4. Gerttrude Stein, a well-known American novelist, was born in 1874 and has died in 1946.

A B C D

5. At summer camp last year children swam, rode horses, and were playing baseball.

A B C D

6. Nam uses to go fishing when he was young.

A B C D