Question

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

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

Answer 1

【答案】A

【解析】

试题分析：句意：当H7N9禽流感首次出现时，人们不知道医生能否治好。If是否；that那；what 什么；why为什么。所以选A。