I ________ the Great Wall twice. The last time I ________ there was two years ago.
A.have been to; go B.have gone to; go C.have been to; went D.have gone to; went
They are watching TV, ________ the others are listening to the radio.
A.and B.so C.or D.that
The desk is in a mess. Would you please ________ your books?
A.take up B.take away C.turn on D.turn off
（2017·四川德阳·33）My mother has taught in this school________ she was twenty years old.
A.for B.until C.because D.since
—Did the doctor ________ your temperature?
—Yes, he did. But I didn't have a fever.
A.do B.spend C.bring D.take
When a virus comes into our body, we get ill. The same thing also happen to a computer.
A.should B.need C.can D.must
