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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

  1. A考查宾语从句的引导词。句意:当H7N9禽流感首次出现的时候,人们不知道医生是否能够治愈它。if"是否",故选择A。

题目来源:同步导学案课时练九年级英语上册人教版 > 单元复习课

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