问题
It’s difficult to ___ these old books for some of them ______ none of the classification.
A:look for; are belonging to
B:put up; belong
C:sort out; belong to
D:pick up; are belonged to
B:put up; belong
C:sort out; belong to
D:pick up; are belonged to
正确答案是：
同类题型
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Thephotographerneedstochargeupthedigitalcameraeverydayasthebattery________quickly
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