题目

There ________ many little libraries in our town in the 1990s. A． are B． was C． were 答案：C【解析】 【详解】 句意： 20世纪 90 年代，我们镇上有许多小图书馆。 考查 be动词。根据 “in the 1990s” 可知句子时态是一般过去时，主语是复数， be 动词用 were 。故选 C 。电路中提供电能的是 ；控制电路通断的是 ．