Will you be back five in the afternoon? -- I am not sure maybe later than that.A

问题补充：

-- Will you be back five in the afternoon?

-- I am not sure, maybe later than that.

A in

B before

C for

D until

答案：

解析：考查时间状语。“下午五点之前你能回来吗？”“我不确定，可能会比五点晚。”A“在...里”，后跟一段时间；B“在......之前”；C“为了，给”；D“直到”。故选B。