作者：英吉
Part of the proposed increase in state education spending is due to higher enrollment, since the number of students in public schools have grown steadily since the mid-1980's and, at nearly 47 million, are at a record high.
(A) enrollment, since the number of students in public schools have grown steadily since the mid-1980's and, at nearly 47 million, are at
(B) enrollment, with a number of students in public schools growing steadily since the mid-1980's and, at nearly 47 million, reaching
(C) enrollment: since students in public schools have grown steadily in number since the mid-1980's and, at nearly 47 million, have reached
(D) enrollment: the number of students in public schools has grown steadily since the mid-1980's and, at nearly 47 million, has reached
(E) enrollment: students in public schools have grown steadily in number since the mid-1980's and, at nearly 47 million, are at
原文意思：教育投入的上升是由于入学率比较高：从二十世纪八十年代开始，共有学校的学生数量一直增加达到47million，已经创了记录。
题目分析：are at a record high的发起者是number of students，并且发起时间是 since the mid-1980's，不能用一般现在时，而且number不能用are，A杀掉。B用reaching和前面的时态也不对应，杀。C中reach的发起者就是students了，发起者不对，杀.D用has reached与number主谓一致并且时态用完成时态和 since the mid-1980's保持对应，留着。E用are at，发起者就是students了，不对，杀！
