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  3. ( ) all forms of advertising, research shows that direct mail reaches the gre...

( ) all forms of advertising, research shows that direct mail reaches the gre...

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问题 ( ) all forms of advertising, research shows that direct mail reaches the greatest number of people
at the lowest cost.
选项 (a) Through
(b) In
(c) Between
(d) Of
答案D
解析
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