The first American performance of this opera was is 1926.was 后面为什么还有is这是什么结构?

when was the very first American Thanksgiving celebrated He is the NBA's first Chinese American什么意思 barack obama is the first ----to be elected president in the U.S.A.' historyA European-American B African-American they were the first white people these Native American people had ever seen.翻译 英语改错:Today I visited the Smiths-my first time visit to American family the first ___who reached American lived a hard lifea) person b )people选哪个为什么啊 大家帮我分析一下这句话的语法,The outpouring of contemporary American Indian literature in the last two decades,ofthen called the Native American Renaissance,represents for many the first opportunity to experience Native American Poetry. Jeremy Lin is the first American player in the NBA of Chinese descent.这个句子是在每日一句上看到得.我觉得是不是这样说更好Jeremy Lin is the first American player of Chinese descent in the NBA He is the first president in American historyThe capital of the US is named after him.he is ... The English corner in the People'sPark ia ____he first met Sam,an American boy.A.where B.in which 英语翻译one of the first signs of what would lay ahead was the american bombing of secret targets inside laos. It was the first major disaster relief effort handled by the new American Red Cross>.特别是relief effort:. Michelle Obama is the first African-American to assume the role of First Lady.Michelle Obama is the first African-American to assume the role of First Lady.这句是简单句还是并列,复合?to assume the role of First Lady做什么成分 It is the first American movie of this kind ( )I've seen.A.which B.what C.that D.when Today I visited the Smiths—my first time visit to an American family.应去掉time具体为什么? 48.threat Their lives were frequently ___ by gas explosion.49.perform The first American ___ of people also remember the first travelvers from england __came to live in American A.whom B.who The first American performance of this opera was is 1926.was 后面为什么还有is这是什么结构?