When________there, the postman found the door locked and then stopped ______the letter under it. [ ]

A. reaching; to stick

B. reached; to stick

C. reaching; sticking

D. reached; sticking

对SSP性能测试中，对每个直达局向的中继连通，作100%局向的各种呼叫（正常和非正常）测试，接通率应（）。

A.＞98%

B.＞99%

C.＞99.9%

D.全部畅通