Mary ________ as a secretary in this company for twenty years and now she stays at home taking care of her own garden.
A．has servedB．had served
C．is servingD．served
D
D　句意：Mary在這家公司當(dāng)了20年的秘書，現(xiàn)在她待在家里照看她的花園�！癕ary在公司當(dāng)秘書”是發(fā)生在過去的事情，因此用一般過去時(shí)，注意Mary現(xiàn)在不在公司當(dāng)秘書了，因此不能用現(xiàn)在完成時(shí)。
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