英语：three and four-------（ be ）seven who ---------(fly) kites at the weekend? They do.
问题描述：
英语：three and four-------（ be ）seven who ---------(fly) kites at the weekend? They do.
是两个小问题。。who和seven分开的
答
three and four （ is）seven.
who(flies ) kites at the weekend? They do.
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