TOEFL Grammar - Find the error

ScottsEnglishScottsEnglish Administrator Posts: 1,301 admin ✭✭✭✭✭✭✭
edited March 2016 in TOEFL Test
Find the error in the following sentence:

During the Nixon administration, wiretapping was use to listen to telephone calls.
     A                             B                                          C                          D

The correct answer is C, which should be "used", the passive voice.


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