他们不知道有会要开。
They didn't know about the meeting.
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didn't英 /ˈdɪdnt/|美 /ˈdɪdnt/
know英 /nəʊ/|美 /noʊ/
解释
know 不变成 knew——didn't 本身表达了过去时，动词恢复原形。
They didn't know about the meeting.
know 不变成 knew——didn't 本身表达了过去时，动词恢复原形。