问题
单项选择题
American Indian languages, which differ widely, tended to group many units of meaning into 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。