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We accomplish this by continually improving our systems of (4) _____ .

Question 1:

We accomplish this by continually improving our systems of (4) _____ .

A. to operate

B. operates

C. operated

D. operation

Feedback The blank comes after the preposition "of" => use a noun.

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Test 6- Toeic part 6 - Practice Toeic | Englishfreetest.com

20 minutes
16 questions