______ by millions every night, television advertisements are a powerful means o

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问题 ______ by millions every night, television advertisements are a powerful means of communication.

选项 A、Being seen
B、Seeing
C、To see
D、Seen

答案 D

解析电视和观看的关系应该是被动的，过去分词表示被动，因此可排除B、C两选项。A选项being seen有强调正在进行的意味，在此并无必要。

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