Question

She ........
......( meet)
me long ago.​

Answer 1

Explanation:

Neither of these expressions is incorrect. The one you want to use depends on what meaning you intend to convey.

If you say, “I met him long ago” (simple past tense) it means just that.

If you say, “I had met him long ago,” (the past participle), it tends to convey the meaning of having met him earlier in the past (which is what the past participle is used for).