【題目】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:當(dāng)H7N9禽流感出現(xiàn)的時候,人們不知道醫(yī)生能否治好它。if是否;that陳述事實(shí);what什么;why為什么。故選A。

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