题目内容
My sister _____ here by now, for she took the early train.
A. could have arrived B. must have arrived
C. ought to arrive D. ought to have arrived
D
情态动词加上完成时态,表示对过去的推测。
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题目内容
My sister _____ here by now, for she took the early train.
A. could have arrived B. must have arrived
C. ought to arrive D. ought to have arrived
D
情态动词加上完成时态,表示对过去的推测。