The result of the study indicated that it was the type of fat made the differenceA. that

问题补充：

The result of the study indicated that it was the type of fat made the difference．

A. that

B. what

C. who

D. as

答案：

(答案→)A. that

B. what

C. who

D. as

解析：此题考查强调句型，其结构为：it is/was+ 被强调的部分+ that,句意：研究结果表明就是脂肪的类型使得有所不同。所以选A。