If you want to book a round-trip ticket,you'll have to pay__$30.

If you want to book a round-trip ticket,you'll have to pay__$30.
A、more
B、other
C、the other
D、another
【正确答案】：D
【题目解析】：more后通常与than搭配，表示比较；0other后通常接复数名词，表示其余的；the other后接单数名词，表示二者之；another表示额外的，再一个。根据句意，此处应指另外再付一定的数目。