问题补充:
We should return the books to the library time.
A. about
B. on
C. by
D. for
答案:
A. about
(答案→)B. on
C. by
D. for
解析:我们把图书归还给图书馆按照常理应该是准时或按时归还,on time表示此意,
故选B。
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