Many people like to talk about generation gaps. I don’t think there isin my family though

问题补充：

Many people like to talk about generation gaps. I don’t think there isin my family, though.

A. it

B. some

C. none

D. one

答案：

A. it

B. some

C. none

(答案→)D. one

解析：句意:许多人喜欢谈论代沟，但是我认为在我的家里没有这种情况。it 代替同一物，one代替同类事物，none表示在数量上没有，可以指人或物；some既可以代替可数名词也可以代替不可数名词。故选D。