A. Americans in China are often asked about things they regard as private.
B. Americans in China are often asked about what they regard as private.
There's probably not a lot of difference intended. In scenario A, possible questions might perhaps be e g Are you happy in your marriage? eg Do you have a lot of money?
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There's probably not a lot of difference intended.
In scenario A, possible questions might perhaps be
eg Are you happy in your marriage?
eg Do you have a lot of money?
In B, a question might be What do you regard as private?