答案:What are they going to bring to the party?
根據(jù)問(wèn)號(hào)可知本句是一個(gè)問(wèn)句。
根據(jù)What推測(cè)本句是一個(gè)What開(kāi)頭的特殊疑問(wèn)句。
根據(jù)are going to 可知這是一個(gè)將來(lái)時(shí)的句子。
to后動(dòng)詞原形 bring,后接表示地點(diǎn)的短語(yǔ)to the party
故答案為:What are they going to bring to the party?