—Where did you have the discussion with Professor Snow?
—It was in the classroom ________ we had a biology lesson yesterday.
| A．which | B．when |
| C．that | D．where |
— Look! How long ________ like this?
—Three weeks! It’s usual here that rain _______ without stopping these days of the year.
| A．has it rained; pours | B．has it been raining; pours |
| C．is it raining; is pouring | D．does it rain; pours |
I won’t tell the student the answer to the math problem until he ______ on it for more than an hour.
| A．has been working | B．will have worked |
| C．will have been working | D．had worked |
Ladies and gentlemen, please fasten your seat belts. The plane _______.
| A．takes off | B．is taking off |
| C．has taken off | D．took off |
I _______ in London for many years, but I’ve never regretted my final decision to move back to China.
| A．lived | B．was living |
| C．have lived | D．had lived |
I was giving a talk to a large group of people, the same talk I _______ to half a dozen other groups.
| A．was giving | B．am giving |
| C．had given | D．have given |