企源知识库

Teaching materials ______ greatly from school to school in the United States.
A、vary
B、various
C、variety
D、different
【正确答案】：A
【题目解析】：vary 变化；various 各种各样的；variety 多样；different 不同的；根据题意此处缺少谓语动词，只有A为动词，因此答案选A