be busy (in) doing sth
be busy (in) doing sth 中的括号是什么意思 干什么用的
括号代表可以加上in,也不可不加 也就是说可以这样:1.be busy doing 2.be busy in doing
()当然代表in可以去掉来用啊,还有be busy with sth 像:spend (in)doing sth
答:busy的两个短语是:be busy with +名词。如:I am busy with my homework. be busy (in) doing, in...详情>>
答:B 被动语态,be found to do. A中的made与found均为过去分词,冲突!详情>>
问:hArd work 和hArd--working有什么区别
答:一个是名词 一个是形容词撒详情>>