You may keep the book for one more week no one else needs it.
A. provided that
B. so that
C. in order that
D. in case
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(答案→)A. provided that
B. so that
C. in order that
D. in case
解析：考查连词用法。provided that=if如果；B以至于；C为了；D以防；句意：如果没有别人需要这本书，你可以多借一个星期。故A正确。