---Would you like to come and join us in the game?

---           . But I must finish my homework first.

A．I hope so

B．I think so

C．I’d love to

D．I’m very tired.

光纤通信正在向长波长、（）单模光纤通信发展。

A.超长波长

B.短波

C.长波

D.长短波