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

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1. When H7N9 bird flu first appeared, people didn't know _____________ doctors could cure it.

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

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北师大版初中英语九年级Unit 8 Getting Ready & Lesson 22 Famous Discoveries第二课时练习

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