Question

Nobody believed a 92-year-old man could run a marathon_______he passed the finishing line. People of all ages can challenge themselves.

A．if

B．since

C．until

D．unless

Answer 1

C

試題分析：考查狀語從句連接詞。句意：沒有人相信一個92歲的老人能參加馬拉松，直到他跑到了終點線。每個年齡段的人都可以挑戰一下自己。not...until...直到......才......。If如果，表條件；since自從；unless除非。故選C。