it must be mary
一定是玛丽
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It must be Mary.
一定是玛丽。
youdao
There is someone at the door. It must be Mary.
有人在敲门，肯定是玛丽。
Mary insisted that her advice was correct and that it must be taken right away.
玛丽坚称她意见是正确，应该马上把它拿走。
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