2. 专升本
  3. They ______ more enthusiastic about their work since their teacher’s return.

They ______ more enthusiastic about their work since their teacher’s return.

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问题 They ______ more enthusiastic about their work since their teacher’s return.
选项 A、are
B、were
C、had been
D、have been
答案D
解析 由since引出的时间状语一般要用现在完成时，所以D正确。
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