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【题目】When H7N9 bird flu first appeared, people didn't know doctors could cure it.

A. if B. that C. what

【答案】A

【解析】句意:当H7N9禽流感首次出现时,人们不知道医生是否能治愈它。if是否;that那个;what什么。根据句意,人们不确定,医生是否能治愈它,故选A。

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