The question you should take this medicine should be decided by your family doctor.A. whyB

问题补充：

The question you should take this medicine should be decided by your family doctor.

A. why

B. if

Cwhether

D. that

答案：

A. why

B. if

(答案→)C. whether

D. that

解析：句意，你是否应该吃药这个问题应该由你的家庭医生来决定。通过分析句子结构，其中包含一个同位语从句。if不能引导同位语从句；在同位语从句中that，whether不作成分，that无实际意义，whether表示“是否”。