The United States, which is a（ ） of the Middle East peace talks, says Israel settlements are an obstacle to peace, and the issue has strained relations with Israel's right-wing government.
作为中东和平对话的倡导者，美国认为以色列的定居点是和平的阻碍，这 个问题加剧了以色列右翼政府的紧张关系。A 选项，志愿者；B 选项，投资者；C 选项，贡 献者；D 选项，保证人，主办人，赞助人。因此选择 D。