Respuesta :
It would be the fourth choice - Had; were.
She "had" heard that the figure skaters "were" arriving. The helping verbs are verbs that help the main verb in a sentence by extending its meaning to be grammatically correct in the sentence.
She "had" heard that the figure skaters "were" arriving. The helping verbs are verbs that help the main verb in a sentence by extending its meaning to be grammatically correct in the sentence.