Jack was in low spirits those days and his friends did all they could ______him up.A.cheer B.cheering C.cheered D.to cheer不是前面有个could 不就应该要用动词原形吗?为什么是选D?

Jack has been in low spirits these days and i have not got the slightest idea what it was that has bothered him .我想知道what it was 在这句话中作什么成分 low in After hearing the sad news ,everyone was A.inAfter hearing the sad news ,everyone was A.in his low spirits B.in low spirit C.in his low spirit D.in low spirits in a low be in low spirit sons-in-low是什么意思 翻译it was a method of refrigeration which rose from his work in low temperature physics I was low in english gammar.I want to learn gammar 12.He was in low spirits and even considered ____(go)away. jack was born (in shanghai in 1990)打括号的部分提问 —and— — jack born? Tom was better than Jack in the exam 改为同义句 jack did______ ______Tom in the exam. Jack was in low spirits those days and his friends did all they could ______him up.A.cheer B.cheering C.cheered D.to cheer不是前面有个could 不就应该要用动词原形吗?为什么是选D? Jack and his father was in beijing yesterday.过去式是用was还是were? 谁知道 He was Jack who helped me out when I was in trouble 哪里错了? in a low voice造句 Sister-in-low 要汉语 it was in america ____she frist met Jack 填that when?which? Jack was (looking through books) in the bookstore this time yesterday.就括号内部分提问