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

A. if B. that C. what

【答案】A

【解析】句意：當(dāng)H7N9禽流感首次出現(xiàn)時(shí)，人們不知道醫(yī)生是否能治愈它。if是否；that那個(gè)；what什么。根據(jù)句意，人們不確定，醫(yī)生是否能治愈它，故選A。

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