--- I think the waiter has forgotten us．We ________ here for over half an hour!

--- I think you’re right．He probably thinks we have already ordered．

A．are waiting                                        B．have been waiting

C．have waited                                       D．will wait

--- I think the waiter has forgotten us. We ________ here for over half an hour!

--- I think you’re right. He probably thinks we have already ordered.

A．are waiting             B．have been waiting

C．have waited             D．will wait