A.should | B.can | C.need | D.must |
A.didn’t arrive | B.haven’t arrived | C.hadn’t arrived | D.couldn’t arrive |
A.mustn’t | B.needn’t | C.shouldn’t | D.can’t |
A.could | B.was able to | C.might | D.would |
A.need | B.could | C.may | D.can |
A.should | B.must | C.could | D.would |
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