他一定是注意到了那个错误——谁都没开口他就改了。
He must have noticed the error, because he corrected it before anyone said anything.
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must英 /mʌst/|美 /mʌst/
have英 /əv/|美 /əv/
noticed英 /ˈnəʊtɪst/|美 /ˈnoʊtɪst/
解释
must have 是对过去感知的推测，noticed 是 notice 的过去分词，表示根据「没人提醒就改了」推断「他已经注意到了」
He must have noticed the error, because he corrected it before anyone said anything.
must have 是对过去感知的推测，noticed 是 notice 的过去分词，表示根据「没人提醒就改了」推断「他已经注意到了」