A lot of air pollution by ordinary people, not only by big factories.

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A lot of air pollution by ordinary people, not only by big factories. [ ]
A. is causing
B. caused
C. is caused

答案

举一反三

Do you know this kind of wine        _ grapes?              [     ]
A. is made of
B. is made in
C. is made from

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These children must _     _ good care of after the earthquake.              [     ]
A. take
B. taken
C. be taken

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—Will you have a trip to Mount Huang tomorrow?
—I won"t go unless my best friend Amy ____ too.[ ]
A. will invite
B. invites
C. is invited

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No permission has for anybody to enter the building. [ ]
A. been given
B. gave
C. given

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—Did you go to Mary"s birthday party last night?
—No, I . [ ]
A. am not invited
B. wasn"t invited
C. didn"t invited

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