请选择CBA4D'};Y.c-u;F0S8t9]:U:j6u Chocolate and sweets are not good _____ our teeth.4C5Q.u)@:K7f9u/h-u1C+O1t5Y.C)@1A
A. at4C5Q.u)@:K7f9u/h-u1C+O1t5Y.C)@1A
B. to4C5Q.u)@:K7f9u/h-u1C+O1t5Y.C)@1A
C. for4C5Q.u)@:K7f9u/h-u1C+O1t5Y.C)@1A