______the flight is canceled, the seminar will have to be postponed.

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问题 ______the flight is canceled, the seminar will have to be postponed.

选项 A、While
B、If
C、Although
D、Besides

答案B

解析 If can indicate a possible situation. Choice(A)indicates simultaneous action. Choice(C)indicates an unexpected result. Choice(D)adds an idea.

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