关于There be句形的问题
有一道题是这样的There ＿ a knife and a fork on the table.A.seems to be B.seem to be C.is seeming to be D.are 为什么不选B前面不用加is?还有答案seem为什么加s,还有There be句型单复数的确定是看前面还是后面?