The recognition that a large-scale war between them would almost certainly be mutually disastrous led to the development of what can be described as codes of conduct designed to facilitate the peaceful resolution of their crises on terms which, if not completely satisfactory, were not wholly unacceptable to either party.
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でも基本的にはDo you~疑問形の場合はYesかNoで答えるんじゃなかったっけ?
だからHow do you think ~でどうすると思いますかなんて訳は無理があるような気がする
正しくは
How Mark is going to use the books that he ordered from the on-line bookstore do you think ?
じゃない?