—The two people speak different languages and can not communicate with each other well.—Oh

问题补充：

—The two people speak different languages and can not communicate with each other well.

—Oh，I see.That’s misunderstanding occurs.

A. when

B. what

C. that

D. why

答案：

A. when

B. what

C. that

D. why

解析：D

解析考查表语从句。结合语境“这就是误解产生的原因”可知，此处应用why引导表语从句。