问题
单项选择题
According to the first sentence, the sales of HDTV sets since last year, by the time when this article was written, had reached ______.
A．4.6 million
B．9.2 million
C．18.4 million
D．I do not know how many
答案
参考答案：D
解析：[分析] 推断题型。 文章第一句话中只提到HDTV的销售量是去年的四倍，并没有提去年的销售量，因而无法推断出写文章时的销售量。