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the last question that our english teacher asked was difficu

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the last question that our english teacher asked was difficult ___
A to answer to B to be answered C answering D to answer
选择哪个,为什么?谢谢!
the last question that our english teacher asked was difficu
D
固定用法:be +adj.to do sth 做……怎么样(was difficult to answer 很难回答)
再问: 可答案是B
再答: 有时答案也有错的呀,正确的是D