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问题: AII the passengers agree to transfer to the next flight---they----a reasonable explana-tion.

A.though;will give
B.if;have given
C.unless;are given
D.on the understanding that;are given

解答:

选D.
On the understanding that...相当于 on condition that...
意思是:在...条件下,以此为条件,如果
eg: I will lend him the money on the understanding that he returns to
me in a month. 我会把钱借给他,条件是他在一个月之内还给我.

我认为你这个句子中的they 应该指的是前面提到的 All the passengers.所以后面用被动语态: are given