TOEFL Grammar - Find the error

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

Find the error in the following sentence:


DNA contains the basic structures an organism needs on order to duplicate itself.
              A                                                       B                         C                         D

DNA contais the basic structures an organism needs in order to duplicate itself.

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