A homework question, exactly quoted,
В этот период у нас было много неожиданных трудностей.
but in reviewing my previous question, When to use 'не было' and 'не будет' regardless of person, gender, or number I am reassured that, without negation, the verb
быть needs to agree in gender and number with the noun.
The last word, the noun, is feminine, but plural.
I believe that without
много, the trailing adjective and noun would be nominative plural.
I often think of verbs, prepositions, etc. affecting other words 'downstream', and yet it seems
многоaffects the verb
Is this a fair assessment?
So should the sentence actually use