单选题The word “they” underlined in Paragraph 4 refers to ______.Ahealth workersBofficialsCvictimsDcases
单选题
The word “they” underlined in Paragraph 4 refers to ______.
A
health workers
B
officials
C
victims
D
cases
参考解析
解析：
指代题。第四段第一句指出“By April 1978, WHO officials announced that they had isolated the last known case of the disease.”，通过句子结构分析，可知that引导announced的宾语从句，因此they指的就是该句的主语WHO officials。因此选B。
指代题。第四段第一句指出“By April 1978, WHO officials announced that they had isolated the last known case of the disease.”，通过句子结构分析，可知that引导announced的宾语从句，因此they指的就是该句的主语WHO officials。因此选B。
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