Being honest is usually thought of as a virtue and undoubtedly this is the __.
问题描述：
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?
答
选D
A issue 问题 B case 实例,案情
C event 事件（由指大事件） D factor 要素,因素
this 指代being honest,应该是在原文中说诚实通常被认为是一种美德,毫无疑问它是---
A和C首先排除,如果选B的话是指前半句话是实情,即诚实是一种美德是实情,这样解释有重复的嫌疑,所以选D,毫无疑问诚实是美德的要素.