They promised to release the hostage in exchange ______ fifty th

They promised to release the hostage in exchange ______ fifty thousand dollars.
A、with
B、of
C、for
D、between
【正确答案】：C
【题目解析】：本题考查词组in exchange for。in exchange for：作为交换，替换，固定搭配，故可直接排除A,B，D。题意为：他们保证释放人质，前提是用五万美元作为交换。答案为C。