一个真正有效的控制系统,应该()。
A、能预测未来
B、等发现出了问题再去解决
C、能调整计划
D、及时发现可能出现的偏差
E、预先采取措施
参考答案:A, C, D, E
—I need a red pen now, mom.
—Oh, I'm busy now, let your father one for you.
A.to buy
B.buying
C.buys
D.buy
Yan Zi and Zheng Jie of China ________the Women’s doubles trophy(奖杯)after winning the final at the Australian Open tennis tournament in Melbourne January 27,2006.
A.held
B.were holding
C.are holding
D.had held