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TOEFL Grammar - Find the error

ScottsEnglishScottsEnglish Administrator Posts: 1,296 admin ✭✭✭✭✭✭✭
edited July 2016 in TOEFL Test

Find the error in the following sentence:


The study involves a willingness for aggregate the data from two different data sets.
                     A                                   B                               C                         D

The study involves a willingness to aggregate the data from two different data sets

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