―What are you doing Jack?―I’m looking for some information about famous peoplecan help me

问题补充：

―What are you doing, Jack?

―I’m looking for some information about famous peoplecan help me make a poster. .

A. who

B. what

C. whom

D. that

答案：

A. who

B. what

C. whom

(答案→)D. that

解析：who谁；what什么；whom谁，宾格；that那个。本句中先行词为下文从句逻辑主语，指为前面整句话内容，故引导词用that，故选D。