TOEFL / IELTS Grammar - Find the error

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

Find the error in the underlined words in the following sentence:

The scientists wondered if someone discovered the reaction before them, so they searched through all of the available research documents.

a. wondered if
b. someone discovered
c. so they searched
d. research documents

Click here for the correct answer.

The scientists wondered if someone had discovered the reaction before them, so they searched through all of the available research documents.

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