TOEFL Grammar - Choose the right word

ScottsEnglishScottsEnglish Administrator Posts: 1,175 admin ✭✭✭✭✭✭✭
edited October 2017 in TOEFL Test

Choose the correct word for the following sentence:

The chemical additive has to be ____________________ slowly into the liquid solution to avoid the risk of chemical burns.

A. introduction
B. introduced 
C. introduce
D. introductory

Click here for the correct answer:

The chemical additive has to be introduced slowly into the liquid solution to avoid the rish of chemical burns.

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