We could have bought a new car last year ,but we really____ it.
A、can't afford
B、couldn't afford
C、won't afford
D、unable to afford
【正确答案】：C
【题目解析】：B Afford支付得起。一般过去时,信号词为last year.
We could have bought a new car last year ,but we really____ it.
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