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问题: 14. 括号内改错

14. 括号内改错
The ideas (those) we have about marriage (to be) part of our cultural background; they are part of our basic beliefs about right and wrong.
A .what...is B. that...are

解答:

B
首先从第一个空来说,是定语从句,从第二个空来说,ideas是复数