单选题
______ the flight is canceled, the seminar will have to be postponed.
A、
(A) While
B、
(B) if
C、
(C) Although
D、
(D) Besides
【正确答案】
B
【答案解析】
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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