Question

1. My friends________me
more than once. (Past perfect)

have called
had called
has called​

Answer 1

Answer:

My friends had called me more than once.

Explanation:

Past perfect = helping (past) verb + 3 form of verb (past participle)

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Answer 2

Answer:

Had Called

Explanation:

As it is in Past perfect check whether

• it is past tense
• if it is, then check for word HAD.

If u want to convert a sentence to past perfect, keep the below in your mind.

Had + V3

Here, Had word is there in 2nd option. And, Called is the V3 of Call.

Hope it helps.