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My brother _____ as an engineer since he came back from the

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My brother _____ as an engineer since he came back from the U.S.
A.had worked
B.works
C.worked
D.has worked
选哪个?为什么?
选D.这应该算是常见的句型吧,since后面跟过去时态的句子时,前面的主句用现在完成时.翻译成:自从我哥从美国回来,他就一直做工程师.强调从他回来那一刻起直到现在他一直都是工程师.