A．5/3
B．1/2
C．3/5
D．7/6
答案：C
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 working
D．has been working
______是教师从事教育教学工作的重要工具，是传播知识和影响学生的重要手段。
