老版prep1/169 答案是不是少了个连词？

雅宝

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 47million, are at

我虽然明白其他选项为何错误以及D是最佳，但是，觉得，D中，has reached 前是不是要加上 and ？
the number of students in public schools has grown steadily since the mid-1980’s and, at nearly 47 million, and has reached.

望大家赐教！

skyzhang

D. Enrollment: the number of students in public schools has grown steadily since
the mid-1980’s and, at nearly 47 million, has reached