When he was studying in Hong Kong, he ________ on his aunt there and have dinner with her once a month． A.should call B.would call C.could call D.might call
Of three people who travel together, there ________ someone who ________ be my teacher． A.must have B.might C.must be D.can E.may be F.could G.may have H. may
It is necessary for all of us to take measure to avoid ________ by the bird flu virus. A.to be affected B.affected C.being affected D.to have been affected
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