Anonymous "They remained at low level" I would use an a here (at a low level). The confusion possibly arises from the fact that we sometimes say things such as at international level, but the two examples are semantically different. Anonymous "It is in present form" When form is used to mean tense, then it can often be used as either a countable or uncountable noun.
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Anonymous"They remained at low level"I would use an a here (at a low level).
Anonymous "It is in present form"When form is used to mean tens