问题
选择题
They _________ the plane, or perhaps they have been prevented from coming for some reason.
A．can have missed
B．can have lost
C．may have missed
D．may have lost
答案
答案：C
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They _________ the plane, or perhaps they have been prevented from coming for some reason.
A．can have missed
B．can have lost
C．may have missed
D．may have lost
答案：C