A.was used to | B.would | C.used to | D.should |
A.will | B.shall | C.should | D.would |
A.should fail | B.should have failed |
C.would have failed | D.may have failed |
A.Shall | B.May | C.Should | D.Need |
A.shall; why | B.may; when | C.would; why | D.will; how |
A.mustn’t | B.mightn’t be | C.needn’t be | D.can’t be |
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