题目内容

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
本题考查时态。根据时间状语once“曾经”可知，该动作发生在过去，用一般过去时。句意：Gary Locke一位美籍华人，曾经在华盛顿政府工作了8年，现在是美国商务部长。
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