Why many adolescents (青少年) have trouble communicating with their parents lies in we call “

问题补充：

Why many adolescents (青少年) have trouble communicating with their parents lies in we call “generation gap.”

A. what

B. that

C. which

D. how

答案：

(答案→)A. what

B. that

C. which

D. how

解析： 本句中的what we call “generation gap.”是一个宾语从句，作为介词in的宾语。其中的what作为动词call的宾语。动词call后面可以接双宾语。句意：很多年轻人和父母亲有交流障碍在于我们称为代沟的东西。That不能在宾语从句中做宾语，which指特定范围之内的某一个，how只能在句中做状语。故A正确。