题干
My uncle is a writer. He ______ many books since he was young.
A：writes
B：wrote
C：is writing
D：has written
答案(点此获取答案解析）
D
My uncle is a writer. He ______ many books since he was young.
A：writes
B：wrote
C：is writing
D：has written
的最大值为 （ ）
。