—I bet someone stole my backpack.—Well,you________ have kept an eye on it A.may B.can C.would D.should

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—I bet someone stole my backpack.—Well,you________ have kept an eye on it A.may B.can C.would D.should

—I bet someone stole my backpack.—Well,you________ have kept an eye on it A.may B.can C.would D.should
—I bet someone stole my backpack.—Well,you________ have kept an eye on it
A.may B.can C.would D.should

—I bet someone stole my backpack.—Well,you________ have kept an eye on it A.may B.can C.would D.should
D,是情态动词加have done 的用法,意思是 本应该 ……