---How often ___________ the Olympics ____________

---How often ___________ the Olympics _____________? ---Every four years.

#42174

is, taken place

is, hold

does, hold

does, take place

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It’s ten o’clock. The children are ___ a good time.

#41953

having

doing

taking

playing

Our classroom ________ very big and clean. We enjoy studying there.

#42373

are

My brother came back home while I           homework.

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am doing

did

was doing

were doing

The book __     __by the young writer sells well. It is popular among middle school students.

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was written

writing

wrote

written

I    take care of my little sister at home today.

#40554

will can

have

had

have to.

共2675题