A-A+
______ the flight is canceled the seminar wil
问题详情
______ the flight is canceled, the seminar will have to be postponed.
A．While
B．if
C．Although
D．Besides
参考答案
正确答案：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.
