题干
A number of books ______ been stolen from the library since the beginning of this term and the number _____ as large as 500.
A：have; are
B：has; i
C：has; are
D：have; i
答案(点此获取答案解析）
D
点M在OA上，且OM=2MA，N为BC中点，则
=（ ）
