A letter of recommendation from the principal and the head of Physics department _____________________ helped her to get the lucrative job. - IQ786

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A letter of recommendation from the principal and the head of Physics department _____________________ helped her to get the lucrative job.

A letter of recommendation from the principal and the head of Physics department _____________________ helped her to get the lucrative job.

Have

Has

Were

Heping

none of the above

Explanation

Because letter is the main subject here and letter is singular.