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

答案A

解析本题考查动词的时态。句子的主句用了现在完成时态，表示从过去一个时间开始一直持续的状态。句中说的是“艾伦比以前快乐多了”。“快乐”的状态从以前的某个时间开始的。所以前面的change应该使用一般过去时态，应该用changed的形式。所以本题的正确答案为A。

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