To understand the situation completely requires more thought than______ thus far

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问题 To understand the situation completely requires more thought than______ thus far.

选项 A、has given
B、was given
C、being given
D、has been given

答案 D

解析时间状语thus far“到目前为止”，与现在完成时连用，据此排除B、C。比较从句完整的结构应该是…than the thought which has been given thus far，可以把than看做关系代词在从句中作主语，也可以看做是省略了从句主语。

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