题目内容
（请给出正确答案）
[主观题]
Man: Where is Joan？ She said she would be here at three. And now it's three-thirty. She mu
st have missed the flight. Woman: I think so. But I hope she won't miss the next one. Otherwise she should be late for the opening address of the conference. Question: What's the woman worried about？
A．Joan may have taken a wrong flight.
B．Joan won't come to the conference.
C．Joan will miss the next conference.
D．Joan may be late for the opening speech.
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