关于it是否能做形式主语的问题

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从高中老师就教我们make it +adj.这种结构中的it是形式主语可以无指代，就像是it is important的用法，但是lz做prep的两个题时发现这好像是不对的，特来求证：是否在G中it必须有所指？
我列出这两道题，欢迎大家讨论~~
219. Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
答案选E，解析中提到A中it无指代

221.The first commercially successful drama to depict Black family life sympathetically and the first play by a Black woman to be produced on Broadway, it was Lorraine Hansberry's A Raisin in the Sun that won the New York Drama Critics' Circle Award in 1959, and was later made into both a film and a musical.
A. it was Lorraine Hansberry's A Raisin in the Sun that won the New York Drama Critics' Circle Award in 1959, and was later made
B. in 1959 A Raisin in the Sun, by Lorraine Hansberry, won the New York Drama Critics' Circle Award and was later made
C. Lorraine Hansberry won the New York Drama Critics' Circle Award for A Raisin in the Sun in 1959, and it was later made
D. Lorraine Hansberry's A Raisin in the Sun won the New York Drama Critics' Circle Award in 1959 and was later made
E. A Raisin in the Sun, by Lorraine Hansberry, won the New York Drama Critics' Circle Award in 1959, and later made it
答案选D，E中同样出现it解析说无指代

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过一小时up一下~牛牛们求教啊

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再补一题，这是做的形式主语还是指代了什么呢？
Minivans carry as many as seven passengers, and compared with sport utility vehicles, most cost less, get better gas mileage, and make it easy for passengers to get in and out, and have a smoother, more car-like ride.
A. and make it easy for passengers to get in and out
B. and allow passengers to get in and out easily
C. and allow passengers to get in and out more easily
D. make it easier for passengers when getting in and out
E. allow passengers to get in and out more easily

答案选A

brfmzbjz

这是逻辑区
发去语法区
把题目编号写在标题里

未来你听见了吗

brfmzbjz 发表于 2014-6-26 14:09
这是逻辑区
发去语法区
把题目编号写在标题里

不好意思。。忘记看分区了，谢谢提醒~~