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  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 本题为语法结构题，考动词时态。本句的关键词是 since，since 表示“自从”，指从过去某一时刻到现在为止，是一段持续的时间。因此，谓语动词应该用现在完成时态。本句大意为：自从他们的老师回来以后，他们就更加热情地工作。
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