Question

SAT一道语法题

A job directory and a job service centre that provides (A) information for (B) students in need of (C) employment is (D) available through the school’s guidance office. No error (E)
这道题选D——————is错了，但是...为什么Provides正确呢？

Answer 1

因为provides的主语是a job service center，而is的主语是a job directory & a job service center。
这样分开来看可能会清楚一点：
A job directory
&
A job service center that provides information for students in need of employment
ARE
available through the school's guidance office.

Answer 2

provides 与that 搭配是正确的，
is 与 A job directory and a job service centre 搭配，因而是错的。