We wih to acknowledge receipt of your letter of March 15,（）reached us yesterday.

This bid is（）your reply reaching US with in 15 working days from today.

A:up to B:subject to C:subjecting to D:subjected to

GSM协议规定，相同信号到达基站的最大时延为（）

A:5us B:10us C:15us D:18us

NR的基本业务时间同步精度和 LTE相同，为±1.5us，协同业务的同步精度为3us（15kz）、0.7us（30khz）、0.19us（120khz）

They've________us ￡15,000 for the housE.Shall we take it?

A:provided B:supplied C:shown D:offered

II.单项填空(共15小题;每小题1分，满分15分) 21.The news came to us as _______ great surprise that he had turned __________ writer.

A: a; a B:a; / C: /; a D: /; /

单项填空（共15题，每小题1分，共15分） Mr. Smith, along with Mr. Green, ___ coming to speak to us about Chinese literature and painting tomorrow afternoon.

A: is B: are C: was D: were

I was told that ____ 10:15 flight would take us to Shanghai in time to reach _____ Fudan University.

A:the;/ B:the; a C:a; the D:/;the