what+are+Sam+and+Summer+doing+是什么意思

what+are+Sam+and+Summer+doing+是什么意思 What ____ Amy and Sam doing?a.are b.am c.is How about you?What are you doing this summer?这句话是什么意思? what+are+you+doing是什么意思 what are you doing?是什么意思 What are Mary and Tim doing? What are Jenny and May doing? what are the children doing是什么意思啊 what are the elephants doing 是什么意思 Hey,Yifan.+++what+are+you+doing.是什么意思 hi sam .this is ____.what are you doing?I am talking for you What are you doing for the summer vacation?what是做的什么成分?