托业考试

试题来源：托业-1
【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

参考答案：B
网考网解析：
If can indicate a possible situation. Choice (A) indicates simultaneous action. Choi... 查看试题解析出处>>