GRE模拟题：自测试题二（5）
文章作者 100test 发表时间 2007:02:25 20:09:26
来源 100Test.Com百考试题网
Questions 13-18
In a benefit concert each of exactly seven solo
performers-Harris， Jones， McIntyre， Nelson， Strapp，
Trevino， and Williams-will sing. The concert director
is deciding the order in which the performers will sing
and is assigning each to exactly one of seven time slots，
numbered consecutively 1 through 7， according to the
following conditions：
Harris must sing at some time before McIntyre sings.
Strapp must sing at some time before Jones sings.
Trevino must sing either immediately before or
immediately after Nelson sings.
Williams must be assigned to time slot 3.
13.Which of the following could be the order， from first
through seventh， in which the performers sing？
（A）Harris， McIntyre， Williams， Trevino， Nelson，
Strapp， Jones
（B）Jones， H
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