some people thint that CD-ROMs will soom be __ booksa:as more popular as b:the most popular than c:so popular as d:more popular than

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some people thint that CD-ROMs will soom be __ booksa:as more popular as b:the most popular than c:so popular as d:more popular than
some people thint that CD-ROMs will soom be __ books
a:as more popular as
b:the most popular than
c:so popular as
d:more popular than

some people thint that CD-ROMs will soom be __ booksa:as more popular as b:the most popular than c:so popular as d:more popular than
D 第一个选项语法错误,as as 是同级比较
b的是错误,最高级不用than
c中的so 错误,so只能用在否定句子中
排除法,只有d是正确的比较级.