My father ____ in a panda protection center for 10 years， so he knows a lot about panda．（ ）
A．was workingB．is working
C．has workedD．will work
My father ____ in a panda protection center for 10 years， so he knows a lot about panda．（ ）
A．was workingB．is working
C．has workedD．will work
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