问题补充：
As we know,Beethoven is the greatest musician .
A. for all the time
B. of all time
C. by all times
D. at all times
答案：
A. for all the time
(答案→)B. of all time
C. by all times
D. at all times
解析：of all time“永远的”，也可为of all times。
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