A.should | B.can"t | C.must | D.mustn"t |
A.don’t | B.didn’t | C.wouldn’t | D.weren’t |
A.If only | B.Only if | C.If | D.When |
A.adopted | B.would adopt | C.had adopted | D.could adopt |
A.shouldn’t | B.mustn’t | C.can’t | D.wouldn’t |
A.could | B.would | C.must | D.need |
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