By the end of this term I --- my Master's degree.A.shall have obtained B.shall obtainA.shall have obtained B.shall obtainC.may have obtained D.ought to have obtained

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By the end of this term I --- my Master's degree.A.shall have obtained B.shall obtain
A.shall have obtained B.shall obtain
C.may have obtained D.ought to have obtained

A.1.By "截止到..." ,与完成时连用.2.Shall "应该",表示对未来的推测,此处用 "will have obtained" 也可以的

A
shall表示对将来(the end of this term)的推测
by the end of……后接完成时,此处是将来完成时