Question

The children in that class … nine years old.

Answer 1

Ответ:

were / are

Объяснение:

were, так как children (дети) - множественная форма

was используется только в единственном числе

Answer 2

Ответ:was

Объяснение:прошедшее время

Answer 3

The sentence you provided is incomplete. It seems like you are trying to say that the children in a particular class are nine years old, but it requires additional information or context to form a complete sentence. Could you please provide more details or complete the sentence so that I can assist you better?