（42）A．方案恰当B．路由器选择恰当；出口带宽偏小，难以满足要求C．路由器配置偏高；出口带宽可行D．路

A、Sorry, you can’t.

B、No, you can’t.

C、Sorry, he is on another line now.

D、No, I don’t know.

-Hello, may I talk to John please？ -().

A: Sorry, he is busy at the moment

B: No, you can't

C: Sorry, you can't

D: I don't know

- Hello, may I talk to the director now？- ________________

A：Sorry, he is busy at the moment.

B：No, you can't.

C：Sorry, you can't.

D：I don't know.

If you a moment, I'll ask the manager to talk with you about the recent developments of the factory.

A．waited

B．are waiting

C．wait

D．have waited

The manager is going to have a meeting, in ______ case we may as well talk to him later.

A．this

B．which

C．whose

D．that

The manager is going to have a meeting, in ______ case we may as well talk to him later.

A．this

B．which

C．whose

D．that

A．A.is understanding

B．B.will understand

C．C.has understood

D．D.understood

A. Sorry, he is busy at the moment

B. No, you can't

C. Sorry, you can't

D. I don't know