Ever since he ______ his job, Allen has been much happier than before.

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问题 Ever since he ______ his job, Allen has been much happier than before.

选项 A、has changed
B、had changed
C、changed
D、changes

答案C

解析 ever since的意思是“从那时到现在”。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。即前面的change应该用一般过去时。所以本题的正确答案为C。

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