语法分析--选择正确的填空,为什么?
问题描述：
语法分析--选择正确的填空,为什么?
Rapids and waterfalls,.along virtually all Massachusetts waterways,provided power in colonial times for grist and saw mills and later for textile mills.
A.common
B.were common
C.which,being common
D.being common,were
答
选A.后置定语,句子的动词是后面的两个
B排除,主语：Rapids and waterfalls,后面逗号,如果直接接系动词,不需要加这个,
C.应该是一个定语从句,但是which 后面有逗号,句子being ...造成句子没有动词了
D.明眼人一看就知道他没希望了