— The pop group S.H.E is said to have been invited to 2013 CCTV Spring Festival Show.

— Really? It’s a long time _______ they three performed together on the mainland.

A．since

B．that

C．when

D．before

凡在发行债券时未作出转换约定的，均为不可转换公司债券。公司发行可转换公司债券，除应具备发行公司债券的条件外，还应当符合股票上市发行的条件。()

A．正确

B．错误