That’s the new machine parts are too small to be seen. A. thatB. whichC. whoseD. What

问题补充：

That’s the new machine parts are too small to be seen.

A. that

B. which

C. whose

D. What

答案：

A. that

B. which

(答案→)C. whose

D. What

解析：考查定语从句。本题定语从句的先行词是the new machine，在定语从句中只有关系代词whose可以指代先行词放在名词parts的前面做定语，句意：那就是那个零部件太小了几乎看不见的新机器。故C正确。