阿摩線上測驗
28. _____ huge numbers of e-mail messages costs spammers very little, since the costs of e-mail messages are
spread out over the internet service providers that distribute them.
(A) The sending
(B) Send
(C) Sending
(D) Sent
答案：登入後查看
統計： A(12), B(11), C(262), D(14), E(0) #2752008
統計： A(12), B(11), C(262), D(14), E(0) #2752008
