Question 9: Find mistakes and correct Mining over 2,000 years ago, copper is one of earliest known (metals.

A. mining

B. ago

C. the

D. known

Explanation: The structure is shortened to: S + V1 + O, S + V2 + O (two subjects are one; V1, V2 have the same tense)

+ When V1 is in the active form, we shorten it to: V-ing + O, S + V2 + O

+ When V1 is in passive form, we reduce it to: P(II) + O, S + V2 + O

Edit: Mining => Mined

Mined more than 2000 years ago, copper is one of the earliest known metals.

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