17.
Your Answer is
Correct Answer is C
Explanation
Item A/B: The underlined part is the position of the predicate verb, you cannot add been after of, and item A/B is excluded.
Item D: The subject is plants, D is wrong.
17.
Your Answer is
Correct Answer is C
Explanation
Item A/B: The underlined part is the position of the predicate verb, you cannot add been after of, and item A/B is excluded.
Item D: The subject is plants, D is wrong.