teachers are present today, and them is 300.
A. A great many; a number of
B. A number of; the number of
C. A dozen of; a great many
D. The number of; a number of
网友回答
A. A great many; a number of
(答案→)B. A number of; the number of
C. A dozen of; a great many
D. The number of; a number of
解析：考查主谓一致及固定搭配。A great many、a dozen of和a number of后面的名词为中心词（主语），谓语要用复数形式。据此可排除此三项。The number of…“….的数量，主语为number，谓语要用单数，故答案B。句意“许多教师今天都出席了，有300人。”the number of指“…的数目”，它的谓语动词用单数; a number of ＝ many，它所修饰的主语的谓语动词用复数。