Gary Locke , a Chinese-American, once______ as the governor of Washington for 8 years and now is U.S. Commerce Secretary．
A．had worked B．worked C．is workingD．has been working
B
本題考查時態(tài)。根據(jù)時間狀語once“曾經(jīng)”可知，該動作發(fā)生在過去，用一般過去時。句意：Gary Locke一位美籍華人，曾經(jīng)在華盛頓政府工作了8年，現(xiàn)在是美國商務(wù)部長。
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