The past perfect is formed with had plus the:
AFuture perfect
BPlain infinitiv
CPast participle
DPresent simple
Answer & Solution
Correct answer: C. Past participle
1. Had is the helping verb of the past perfect.
2. It never stands alone in this tense.
3. It joins the past participle of the main verb.
4. So the answer is the past participle.
_Source: NCERT Class 9 English Poorvi, Unit 1 'How I Taught My Grandmother to Read'_
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