TOEIC Grammar - Choose the right word

ScottsEnglishScottsEnglish Administrator Posts: 1,093 admin ✭✭✭✭✭✭✭

Choose the right word for the following sentence.

The manual says that the machine needs to be serviced ___________________ for best performance.

A. usually
B. rarely
C. annually
D. safely

Click here for the correct answer.

The manual says that the machine needs to be serviced annually for best performance. 

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