Здрасти. Помогите определить время и залог выделенных глаголов в скобках:
In the past, food manufacturers (have resorted) to inefficient “breakdown” maintenance, which occurred shortly, or a considerable time, after detection of the failure.
As the failure (may be detected) too late in this type of maintenance, contamination (may already have taken) place, which may result in food safety problems, inferior product quality, and, finally,…