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SAT语法一道According to some demographers, the number of United

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SAT语法一道
According to some demographers, the number of United States citizens aged 65 or older is likely to rise to 87 million by 2050. no error
by 2050 为什么不用将来完成时?
(By)the early 1920's,Louis Armstrong recorded his first solos as a member of KingOliver's Creole Jazz Band in such pieced as "Chimes Blues" and "Tears"
,whichhe composed with pianist Lil Hardin.另一个sat语法
By改成in 对比解释下 最好纯语法 尽量别语义
第一句已经有likely to do 了.
第二个如果是by的话就要用过去完成时.