问题描述：
Supposing the plane doesn't arrive on time ,we __ postpone the meeting.
A.will have to
B.could
C.have had to
D.are having to
为什么?
请详细说明每个选项.
A.will have to
B.could
C.have had to
D.are having to
为什么?
请详细说明每个选项.
问题解答：
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