門戸 もんこ開放 かいほう政策 せいさくじゃありませんでした
monkokaihōseisakujārimasendeshita

Noun
Desu Copula

The polite, past negative form of 門戸開放政策

1. Was not an open-door policy.; Was not a policy of open access.

Past/Perfective
Negative
Polite
Terminal Form