The boy ______ his mistake before his teacher told him.[ ]A. realizes

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The boy ______ his mistake before his teacher told him.[     ]
A. realizes
B. has realized
C. had realized
D. would realize

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举一反三

The teacher ____ the office for a few minutes when we arrived. We didn"t meet him. [     ]
A. had left
B. had left
C. has been away from
D. had been away from

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根据句意，用括号内所给动词的适当形式填空。1. By the end of last year, I ________ (be) to the West Hill Farm three times.
2. By the time I got up, Mom ________ (go) out for some exercise.
3. I ________ (learn) 1,000 English words by last term.
4. By 9 o"clock last night, we ________ (get) 200 pictures from the spaceship.
5. When I went into the classroom, the final bell ________ (ring). I was happy that I wasn"t late.

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—Did you meet Tom at the airport?
—No. His plane ________ by the time I ________ there. [ ]
A. has taken off; got
B. took off; had got
C. took off; arrived
D. had taken off; arrived

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We ______ four thousand new words by the end of last year. [ ]
A. learned
B. had learned
C. have learned
D. will learn

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By nine o"clock yesterday evening, we ______ our work.[ ]
A. have finished
B. finished
C. had finished
D. finish

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