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问题: 词间的差异(7)

Being honest is usually thought of as a virtue and undoubtedly this is the __.
A issue B case C event D factor
选什么?为什么?

解答:

选B,这句话的意思是诚实通常被认为是一种美德,并且毫无疑问事实正是这样.
this is the case:正是如此