TOEFL / IELTS Grammar - Find the error

ScottsEnglishScottsEnglish Administrator Posts: 1,301 admin ✭✭✭✭✭✭✭
edited November 2018 in TOEFL Test

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

The experiment was difficult, but the researchers found that the key for killing the bacteria comes from a new strain of antibiotic created for the purpose in the laboratory.

a. was difficult
b. key for killing
c. a new strain of
d. for the purpose

Click here for the correct answer.

The experiment was difficult, but the researchers found that the key to killing the bacteria comes from a new strain of antibiotic created for the purpose in the laboratory.

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