—How long can we read in the library? —It from 8 a.m. to 6p.m..A. opensB. openC. is openD

问题补充：

—How long can we read in the library? —It from 8 a.m. to 6p.m..

A. opens

B. open

C. is open

D. opening

答案：

A. opens

B. open

(答案→)C. is open

D. opening

解析：

试题分析: 句意：我们能在图书馆里看多久？图书馆从上午八点到下午6点开放。open开（及物动词）,用于主谓宾结构；开放的（形容词），用于主系表结构;it它，指图书馆，无宾语，应为主系表结构，故选C