()you should ______do the work well. A.be able to B.can C.mustD.a_英语解答

()you should ______do the work well. A.be able to B.can C.mustD.are able to

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解答

A.should情态动词后只能用动词原型,can,must,本身也是情态动词,只能放在谓语位置,不能用在其他情态动词后,are的原形是be