摘要：8． another survivor under the ruins made the soldiers very happy despite their tiredness. A．Discovering B．To discover C．Discovered D．Discover 答案 A 解析 分析句子结构可知句子缺少主语.过去分词.动词短语不能在句子中作主语.所以排除C.D两项.不定式作主语表目的或将来.也不符合题意.所以正确答案为A.

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