The positive meaningswords in an ad and how they are presented in an interesting way play

问题补充：

The positive meaningswords in an ad and how they are presented in an interesting way play an important role in promoting a product.

A. are attached to

B. attached to

C. attaching to

D. having attached to

答案：

A. are attached to

(答案→)B. attached to

C. attaching to

D. having attached to

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