A.shall | B.need | C.should | D.can |
A.must | B.need | C.may | D.ought |
A.hadn’t better | B.wouldn’t better | C.would better not | D.had better not |
A.can’t | B.mustn’t | C.shouldn’t | D.may not |
A.might leave | B.must leave | C.can have left | D.may have left |
A.might; turned to | B.should; turned up |
C.could; turned in | D.must; turned on |
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