（重写句子） The people were standing on the bridge. They waved to the

（重写句子） The people were standing on the bridge. They waved to the pilot. The pilot did not notice them. (compound-complex sentence)
【正确答案】：The people who were standing on the bridge waved to the pilot, but he did not notice them.

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（重写句子） The people were standing on the bridge. They waved to the

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