多选题

以下哪个语句能够查找姓名为refactor的文档（ ）

Question

A. db.users.find({\"name\":{\"first\":\"refactor\",\"last\":\"refactor2\"}})

B. db.users.find({\"name\":{\"first\":\"refactor\"}})

C. db.users.find({\"name.first\":\"refactor\",\"name.last\":\"refactor2\"})

D. db.users.find({\"name.first\":\"refactor\"})