Remember that there is still one point we must make clear at the conference tomorrow.A.

问题补充：

Remember that there is still one point we must make clear at the conference tomorrow.

A. where

B. why

C. when

D. that

答案：

A. where

B. why

C. when

(答案→)D. that

解析：考查定语从句的关系词。先行词是one point，在定从 we must make clear at the conference tomorrow中作make的宾语，所以用that引导。选D。