【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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