下列说法,正确的有( )
A. 发明必须是正确利用自然规律的结果
B. 发明必须是前所未有的
C. 发明必须是具体的技术方案
D. 发明能够被较为稳定的反复实施
In the past few years, our company _______________ a great deal of attention to building up company culture.
A. pays
B. would pay
C. is paying
D. has been paying
We will provide you with tips to help you keep your stress levels ______________ control.
A. for
B. out
C. under
D. with