TOEIC Grammar - Choose the right word

ScottsEnglishScottsEnglish Administrator Posts: 1,175 admin ✭✭✭✭✭✭✭

Choose the right word for the following sentence.

The technician cautioned us ______________ sending voluminous attachments in our emails.

A. against
B. for
C. to
D. that

The technician cautioned us against sending voluminous attachments in our emails.

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