但事实上，要是我来选的话，我会选择a为正确答案，因为它是一般过去时的形式，与句中的bought、yesterday和didnt的时态保持一致。

Actually, I would have selected a as the correct answer because it is past tense in keeping with the sentence - "bought", "yesterday" and "didn't".

youdao

但事实上，要是我来选的话，我会选择a为正确答案，因为它是一般过去时的形式，与句中的bought、yesterday和didnt的时态保持一致。

Actually, I would have selected a as the correct answer because it is past tense in keeping with the sentence - "bought", "yesterday" and "didn't".

youdao