【題目】When H7N9 bird flu first appeared,people didn’t know _____ doctors could cure it.

A.if B.that C.What D.Why

【答案】A

【解析】

試題分析:句意:當(dāng)H7N9禽流感首次出現(xiàn)時,人們不知道醫(yī)生能否治好。If是否;that那;what 什么;why為什么。所以選A。

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