能够引起合同法律关系的产生、变更与消灭的是( )。
A．法律后果 B．行为 C．法律事实 D．事件
参考答案：C
The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others．
A．were it not for
B．had it not been because
C．had it not been for
D．if it had not been
国家可以对底土及底土中的资源开发、利用和科研活动行使部分主权。
