[ Past Continuous Tense ]
We ……… in the classroom, when the headmaster entered
A. have all been sitting
B. don’t sit
C. were all sitting
D. are all sitting

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A. bored
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Choose the correct option to complete the gap.
He _______ his lunch when the doorbell rang.
A. is having
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C. has
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You had better ………… a doctor about that bad cough.
A. to see
B. see
C. seeing
D. to seeing