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【单选题】

-A medical team was sent to Japan by air five hours ago.
-So they ________ have arrived by now.The flight usually takes four hours or so.
[ ]

A.
might
B.
could
C.
must
D.
need
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参考答案:
参考解析:
.
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举一反三

【单选题】It is third time that he______ his homework since he______ to this school

A.
doesn’t finish; comes
B.
hadn’t finished; came
C. hasn’t finished; came D didn’t finish; came