My aunt _____ here by now, for she took the early bus.
A．must arriveB．can arriveC．may arriveD．ought to have arrived
D
ought to除了可以跟should一樣表示“應(yīng)該”之外，還可以表示推測，“照理應(yīng)該”，而must表示相當(dāng)肯定的語氣，“一定；必定”，本題還著重考查正確使用時(shí)態(tài)，表示到目前應(yīng)該已經(jīng)發(fā)生用ought to +完成時(shí)態(tài)。
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