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1が答えなのですがhave beenの後にchangesという現在形が置かれてるのは何故ですか?
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Since the beginning of the twentieth centuYy, there (
S王] | political and social changes in Africa.
基本
① have been ② are
③ are being ③④ has been (東海
) many
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ありがとうございます!