请选择ABCD9E*Y6v*b0u;{6^:h1T,u'T0_8B4SPeople in the west make _______ a rule to buy Christmas presents for their relatives and friends.*e2S,K+v6Q4R/G7d(B5@;?.Z3L5`(z
A. it*e2S,K+v6Q4R/G7d(B5@;?.Z3L5`(z
B. that*e2S,K+v6Q4R/G7d(B5@;?.Z3L5`(z
C. this*e2S,K+v6Q4R/G7d(B5@;?.Z3L5`(z
D. as*e2S,K+v6Q4R/G7d(B5@;?.Z3L5`(z