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19.When H7N9bird flu first appeared,people didn't know ________ doctors could cure it.(  )
A.ifB.thatC.whatD.why

分析 当H7N9禽流感首次出现时,人们不知道医生能否治好这种病.

解答 答案:A.
根据people didn't know,可知本句考查了宾语从句的用法.在宾语从句中所使用的语序应该是陈述句语序.再根据 doctors could cure it,可知这里不缺少句子成分,所以不能用what或why引导,在这里含有疑问的语气,所以用if引导这个宾语从句,表是否.故选A.

点评 此题考查宾语从句.考生在答题时要注意"宾语从句必须采用陈述语序",根据上下文语境确定合适的选项.

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