But gradually,people realized that only through making educated choices about their personal lives and habits ____they begain to pretect thenselvesA could B may C must Dshould这题选什么?理由?

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But gradually,people realized that only through making educated choices about their personal lives and habits ____they begain to pretect thenselves
A could B may C must Dshould
这题选什么?理由?

could 表示能够 句中有几个单词错了吧?!应该是:begin to protect themselves.