题目内容
选择正确的单词或短语完成句子。
用join in, take part in或attend填空。
They all ___________ singing “Happy Birthday” to the teacher.
答案：joined in
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题目内容
选择正确的单词或短语完成句子。
用join in, take part in或attend填空。
They all ___________ singing “Happy Birthday” to the teacher.