题目内容：

The country’s chief exports are coal,cars and cotton goods,cars ____ the most important of these.
A) have been B) being C) are D) are being

优质解答

B) being 这句话原来 是这样子的:The country’s chief exports are coal,cars and cotton goods,the most important of these are cars .把cars 提前,就变成了分词短语,而不再是句子了.cars是其逻辑主语....