因为后面是come,如果是coming,就选are了.be doing是进行时态.
be + 动词原形,不是任何时态.
have + done 是现在完成时.翻译成：一个歌手和一个舞蹈家已经来到了北京.
come 原形 came 过去式 come过去分词
the singer and the dancer（）come to Beijing.为什么要选have,而不是are呢
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