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that ship sent a radio message_____ ______help.那船发出了无线电求救信号.

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that ship sent a radio message_____ ______help.那船发出了无线电求救信号.答案添的是asking for.为什
为什么用asking for
that ship sent a radio message_____ ______help.那船发出了无线电求救信号.
that ship sent a radio message_____ ______help.那船发出了无线电求救信号.答案添的是asking for.为什
因为asking for help是【现在分词短语】,在句中做伴随状语,即:发信号的同时就是【求助】.