---Mary’s score on the test is the highest in her class.

---Really? She ______ have studied very hard.

A．may

B．ought to

C．must

D．should

首次公开发行股票招股说明书应披露( )对发行人是否存在同业竞争和避免同业竞争有关措施的有效性所发表的意见。

A．发行人律师

B．主承销商

C．发行人审计机构

D．发行人董事会