目前国际上形成的不同的数字电视广播标准有()。

A.PDTV标准

B.DVB标准

C.ISDN标准

D.SECAM标准

E.SDTV标准

The teacher suggested that her students__________experiences with ESP.

A．write a composition on their

B．to write composition about the

C．wrote some compositions of his or her

D．had written any compositions for his