It is said that in the United States,over 30 ____spent on ad

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It is said that in the United States,over 30 ____spent on advertisement each year.
a)billion dollars is b)billion dollars are
c)billion dollar is d)billions of dollars are

B
一般billion,million,hundred 后面不加s,只有在表示成百上千等时,才加s,eg:hundreds of students are dancing in the street.
dollar 表示美元,是可数的,要加s.

紧急求救一道英语试题It is said that in the United States,over 30 ____s it is well known that sports popular in the united states 是什 It is reported that the United States uses _________ energy New York is ( ) in the United States He said that he ____________to the United States 英语翻译It is commonly believed in United States that school is 英译汉 In cities all over the United States , it is wanshing,d.c.it is in thn east of the united states . it is wanshing,d.c.it is in thn east of the united states It was in the United States that I made the _________ of Pro it was in the United States that I made the acquaintance of fifteen,morning,the United States,it,in,to,is,nine,the,in连词成