Question

who is/are this boy and this girl ?The boy is Dale. The girl is Jelly. is /are选哪个？

Answer 1

选is（因为后边的回答已经提示了，回答用的是is，假设你对划线部分“the boy”提问的话，当然也要用is）相当于：Who is this boy and (who is) this girl？是分开的。句子中，who做表语。例：What is your given name?What--表语，is-- 系词，your given name--主语

Answer 2

are, 因为句子的主语是this boy and this girl, 回答；This boy and this girl are......, 所以who是表语