let's hurry. they ________ be waiting for us. A.must B.could C.can D.would

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let''shurry.they________bewaitingforus.A.mustB.couldC.canD.wouldlet''shurry.they________bewaitingforus

let's hurry. they ________ be waiting for us. A.must B.could C.can D.would
let's hurry. they ________ be waiting for us. A.must B.could C.can D.would

let's hurry. they ________ be waiting for us. A.must B.could C.can D.would
A must
must be 表示推荐,猜测,意思是一定在做什么.