Disadvantages as they have, online games never fail to a large number of teenagers．
A. appeal to
B. object to
C. refer to
D. turn to
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(答案→)A. appeal to
B. object to
C. refer to
D. turn to
解析：考查词组辨析。Appeal to 吸引，呼吁 object to 反对 refer to 参考，涉及 turn to 向某人求助
句意为尽管网游有缺点，但是他们从来都能吸引大量的青少年。