When I called you this morning,nobody answered the phone.Where?
| A． | did you go | B． | have you gone |
| C． | were you | D． | had you been |
--- Ouch! You hurt me!
--- I am sorry. But I _____ any harm. I ____ to drive a rat out.
| A．didn’t mean , tried | B．don’t mean , trying |
| C．haven’t meant , tried | D．didn’t mean, was trying |
I’m calling about the apartment you ____ the other day. Could you tell me more about it ?
| A．advertised | B．had advertised |
| C．are advertising | D．will advertise |
We _____ on this project for four hours. Let’s have a rest.
| A．are working | B．have been working |
| C．worked | D．had worked |
Experiments of the kind ____ in both the U.S. and Europe well before the Second World Wall.
| A．have conducted | B．have been conducted |
| C．had conducted | D．had been conducted |
By the time Jane gets home, her aunt ____ for London to attend a meeting.
| A．will leave | B．will have left |
| C．leaves | D．left |