A、  B、  C、  C题干是以疑问词开始的特殊疑问句。不能用Yes／No来回答，首先排除(B)项。题干询问的是这本书最多可以借出多长时间，(C)项的回答“最长借书期限是两周”符合题意，是正确答案。(A)项可以用来回答询问地

Didn’t we see these samples last week?
(A)I’d love to sample some.
(B)Sure, I’ll bring them next week.
(C)No, these are slightly different.

How long can I check these books out?
(A)They’re down the hall.
(B)Yes, but only two at a time.
(C)The maximum time is two weeks.