单选（4-6）

4. He ______ English for 8 years by the time he graduates from the university next year.

A. will learn B. will be learning

C. will have learnt D. will have been learnt

5. Legend has it that the origin of the Dragon Boat Festival is to ______ the soul of Qu Yuan.

A. remember B. remind C. recover D. recall

6. Young as he is, David has gained ______ rich experience in ______ society.

A. the; the B. a; / C. /; / D. /; the