______ 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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