A.will | B.May | C.have to | D.Should |
A.should | B.might | C.would | D.could |
A.is not polluted | B.would not be polluted |
C.had not been polluted | D.would not have been polluted |
A.must | B.would | C.could | D.May |
A.mustn"t; should do | B.needn’t; should have done |
C.may not; should do | D.can"t; should have done |
A.wouldn’t | B.mustn’t | C.shouldn’t | D.needn’t |
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