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这是考察的非谓语动词吗?Itwasreportedthatthethreelittleboysinthecaveforfivedayswerestillalive.选项有AtrappedBbeingtrappedCweretrappedDhadtrapped为什么是选择a啊??c项为什么不对啊

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这是考察的非谓语动词吗?It was reported that the three little boys ____ in the cave for five days were still alive . 选项有A trapped B being trapped C were trapped D had trapped 为什么是选择a啊??c项为什么不对啊
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因为后面有 were still alive 有动词了,要用分词,不然要有连接词来连接