Question

めがね

これstayed closedっていいんですか？

The teacher talked about the Tokugawa shogunate as if she had lived in the Edo period.
6「そうでなければ~だっただろうに」条件を表す otherwise
The “Black Ships" came to Japan in 1853; otherwise, Japan would have stayed closed
longer.
>前述の事態が起こらなかった時に予想される結果を導入するために用いる
名件をま す司詞石