I'd like to _this old car for aI'd like to _this old car for a new model but I am afraid I cannot afford it.A exchangeB convertedC replaceD substitute答案给的是D 请问为什么?substitute A for B的意思不是用A代替B吗?难

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I''dliketo_________thisoldcarforaI''dliketo_________thisoldcarforanewmodelbutIamafraidIcannotaffordit.

I'd like to _________this old car for aI'd like to _________this old car for a new model but I am afraid I cannot afford it.A exchangeB convertedC replaceD substitute答案给的是D 请问为什么?substitute A for B的意思不是用A代替B吗?难
I'd like to _________this old car for a
I'd like to _________this old car for a new model but I am afraid I cannot afford it.
A exchange
B converted
C replace
D substitute
答案给的是D 请问为什么?substitute A for B的意思不是用A代替B吗?难道是用旧车代替新的?这和正确翻译不符合啊?