26.

Answer and Explanation

Your Answer is

Correct Answer is H

Explanation

Judge the predicate verb as had performed according to the meaning of the clause and the following time word (for years). Item H is correct in past perfect tense.

Item J: did performed is the wrong form of verb expression.

Item F/G: The underlined part guides the attributive clause to modify the instructor, and the clause lacks a subject. You must choose the nominative who, and you cannot choose the accusative who.