She is always the first staff to go to the office and the last to leave. I guess is why she is promoted so quickly.A. who B. which C.that D.what 题目和参考答案——青夏教育精英家教网—

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She is always the first staff to go to the office and the last to leave，______ I guess is why she is promoted so quickly.

A. who B. which C.that D.what

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