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My aunt _____ here by now, for she took the early bus.

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My aunt _____ here by now, for she took the early bus.
A.must arrive B.can arrive C.may arrive D.ought to have arrived
D

ought to除了可以跟should一样表示“应该”之外,还可以表示推测,“照理应该”,而must表示相当肯定的语气,“一定;必定”,本题还着重考查正确使用时态,表示到目前应该已经发生用ought to +完成时态。