31,37,41,43,(),53。
A.51
B.45
C.49
D.47
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:31,37,41,43,(),53A.51 B.45 C.49D.47
11, 13, 16, 21, 28, ()A.37 B.39 C.41 D.47
23 29 31 37 () A. 41 B. 40 C.43 D.45
4,7,11,18,29,() A.37B.40C.43 D.47
31,37,41,43,(),53 A.51B.45C.49D.47
23,29,31,37,()。A.41B.40C.43 D.45