[题目]When H7N9 bird flu appeared, people didn't know doctors could cure it.A.ifB.thatC.whatD.why 题目和参考答案——青夏教育精英家教网——

题目内容

【题目】When H7N9 bird flu appeared, people didn't know __________ doctors could cure it.
A.if
B.that
C.what
D.why

【答案】A
【解析】句意：当H7N9禽流感出现的时候，人们不知道医生能否治好它。if是否；that陈述事实；what什么；why为什么。故选A。

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