Topics: 原来 (yuánlái) 就是 (jiùshì) 怪不得 (guàibude) 本来 (běnlái)
Level: Qing Wen
Topics: 刚 (gāng) 怪不得 (guàibude)
Level: Elementary
Topics: 原来 (yuánlái) 反正 (fǎnzhèng) 往往 (wǎngwǎng) 怪不得 (guàibude) 悄悄 (qiāoqiāo) 竟然 (jìngrán) 简直 (jiǎnzhí)
Level: Intermediate
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