Question

人間

なぜwereではなくwasなのでしょうか？

次の各英文の空所に入れるのに最も適当な語句を, ア~エから一つ選べ。
13. More than one (
) found in his unpublished document by the
editor of the publishing company.
イ、 mistake were
7. mistake was
エ, mistakes were
ウ. mistakes was

英語