【題目】---The accident might not have happened had we been more careful.

---But we _________ at that time.

A. weren’t B. didn’t

C. hadn’t D. don’t

【答案】A

【解析】句意：----如果我們之前更認(rèn)真一些，或許就不會(huì)發(fā)生這場(chǎng)事故了。

----但是我們那時(shí)沒有認(rèn)真。

根據(jù)語境，上句是對(duì)過去的虛擬，下句陳述了過去（沒有認(rèn)真）的事實(shí)，故用一般過去時(shí)，相當(dāng)于But we weren’t careful at that time。故選A。

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