Mr Li _____ the students' work when I entered his room. [ ]

A. goes over

B. went over

D. is going over

D. was going over

外汇指定银行向外商投资企业提供人民币贷款，可以接受债务人的外汇质押，但质押外汇来源仅限于企业的（）账户。

A、资本金账户

B、经常项目结算账户

C、经常项目外汇账户

D、资本项目外债专户