Why didn't I think of that before?這里的助動(dòng)詞為何用didn't,而不用don't.
Why didn't I think of that before?這里的助動(dòng)詞為何用didn't,而不用don't.
英語人氣：397 ℃時(shí)間：2020-06-24 16:38:09
優(yōu)質(zhì)解答
是before 之前的事情,是過去時(shí)
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