FIDIC施工合同条件规定的合同有效期的结束时间是以( )之日为标志。
A.工程接收证书签发
B.颁发履约证书
C.“结清单”生效
D.提交竣工报表
参考答案:C
There __________ a teacher and some students in the classroom. [ ]
A. is
B. are
C. have
D. has
________ a moment and I will go to your rescue.[ ]
A. Go on
B. Hold on
C. Move on
D. Carry on