_____ the Hope Project started, it has helped thousands of students return to school.
- A.For
- B.When
- C.Since
- D.Before
正确答案及解析
正确答案
C
解析
此题考查介词的用法。此题意：自从希望工程开始以来，已经成帮助了成千上万的学生返回学校。since自从，before……之前，when当……时候。
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