Cultural values may be defined as assumptions ___ is right or wrong shared by the members of a society.A,about whichever

Cultural values may be defined as assumptions ___ is right or wrong shared by the members of a society.A,about whichever B,concerning whatever C,on which D,as to what 我选了B,参考答案是D.请您给我说说,B为什么错了,又为什么选择D呢?Foreign students ___Chinese literature last year at this university came chiefly from Japan and South Korea.A,who were studing B,studied C,were studing D,studying 我选择了B,参考是A.请您给我说说,B为什么又错了呢?又为什么选择A.要是能介绍一本您认为实用的语法书给我学习一下,那就更好啦.惭愧,我的语法学得不好.