When H7N9 bird flu first appeared,people didn't know doctors could cure it. A. if B. that C. what D. why 题目和参考答案——青夏教育精英家教网—

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( ) 4. When H7N9 bird flu first appeared,people didn't know doctors could cure (治疗) it.

A. if B. that C. what D. why

4. A

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