kept
v.（使）保持， （使）继续（ keep的过去式和过去分词 ）；（食品）保持新鲜；保有；保存
网络保持；不断地；不断；保存
1 . A skeleton staff of 20 is being kept on.
留下了20名骨干人员。
来自柯林斯例句
2 . The plane has been kept in service far longer than originally intended.
这架飞机已经超期服役很长时间了。
来自柯林斯例句
3 . He kept encouraging Rosie to find a place of her own.
他不断鼓励罗茜为自己找个住处。
来自柯林斯例句
4 . Mike kept snatching him up by the collar and jerking him up.
迈克一直揪着他的领子把他往上猛举。
来自柯林斯例句
5 . The child kept her eyes fixed on the wall behind him.
这个小女孩眼睛一直紧盯着他身后的那堵墙。
来自柯林斯例句
1 . 保持
...【解析】句意：这项研究的取样样本是120万瑞典新兵……。A项kept(保持)；C项found(发现)和D项helped(帮助)都不适合。53．选D项results(结果)。
2 . 不断地
they keptimproving their technical skill ., 他们不断地提高他们的技术水平.
3 . 不断
Economic returns have further improved. National revenue has keptgrowing ., 经济效益进一步提高 , 财政收入不断增长.
4 . 保存
assure that installation documentation for customer projects is well keptand centralized., 妥善保存和管理客户的安装资料和文件.