问题
单项选择题
American Indian languages, which differ widely, tended to group many units of meaninginto multisyllabic words.
A.all tend
B.and tend
C.to tend
D.tending
答案
参考答案:A
解析: 时态应用。 本句描述一般现象,谓语动词用一般现在时。主语和谓语间不能插入"and",all在这里作主语的同位语。