(  ) a teacher in a university, it is necessary to have at l

(  ) a teacher in a university, it is necessary to have at least a master's degr

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I appreciate(  )to your home.

I appreciate(  )to your home.A.to be invited B.to have invited C.having invited

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They are considering (  )before the prices go up.

They are considering (  )before the prices go up.A.of buying the house B.with bu

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We regret (  )you that the materials you ordered are out of

We regret (  )you that the materials you ordered are out of stock.A.informing B.

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If you smoke in a non-smoking section people(  ).

If you smoke in a non-smoking section people(  ).A.will object B.objected C.must

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