The workers (were ) on a strike for three week when the agreement on pay (was reached).
The answer is: <span>
c. should, have, could
In English Literature, Helping verbs refer to the verbs that help other verbs to extend its meaning in the sentence, explain the mood in the sentence or add additional details on time. Helping Verbs usually only used in Complicated Tenses
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Answer: part of a fish and an instrument for weighting