Teenagers should be cautious about the content on social networking sites, for their tastes and preferences by what they see in the media.A. shape B. were shapedC. are shaped D. have shaped 题目和参考答案——青夏教育精英家教网—

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Teenagers should be cautious about the content on social networking sites, for their tastes and preferences ________ by what they see in the media.

A. shape B. were shaped

C. are shaped D. have shaped

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