单选题The fact that fun is

问题补充：

单选题Thefactthatfunisnotequaltohappinessmaybetheoppositeof______manypeopleactuallyunderstand.A.whyB.thatC.whichD.what

答案：

D解析考察宾语从句。What引导宾语从句what many people actually understand并作为understand的宾语。Which指特定范围内的某一个。故D正确。