Of all the goals of the education reform movement, none is more difficult than developing an objective method to assess teachers

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问题     Of all the goals of the education reform movement, none is more difficult than developing an objective method to assess teachers. Studies show that over time, test scores do not provide a (1)______ means of separating good from bad instructors.
    Test scores are an(2)______ indicator of quality because too many factors outside of the teachers’ control can influence student(3)______ from year to year—or even from classroom to classroom during the same year. Often, more than half of those teachers (4)______ as the poorest performers one year will be judged average or above average the next, and the results are(5)______ as bad for teachers with (6)______ classes during the same year.
     (7)______, there’s a far more direct approach: measuring the amount of (8)______ a teacher spends delivering relevant instruction—(9)______, how much teaching a teacher actually gets done in a school day.
    This is hardly a new(10)______. Thirty years ago two studies using this approach found that some teachers were able to deliver(11)______ 14 more weeks a year of relevant instruction than their less efficient(12)______.
    There was no(13)______ to their success: it was obvious that the efficient teachers(14)______ strictly to the curriculum, maintained stern discipline and(15)______ non-instructional activities, like(16)______ unessential classroom business when they(17)______ focused on the curriculum.
    And both studies found that the teachers who(18)______ more were also the teachers who(19)______ students who performed well on(20)______ tests.
(17)

选项 A、must have been
B、may have been
C、could have been
D、should have been

答案D

解析 语法题。这句话前半部分说,高效率的老师应该严格遵守课程表,纪律严明,尽量减少与教学无关的活动。然后后半部分举例说明,比如他们本应该聚焦于课程之上,但却去组织无关的课堂活动。所以when引导的应该是一个虚拟句,所以选D项,should have been,表示本应该做什么但却没做。
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