用be slow in doing sth造句

用be slow in doing sth造句 without enough money ,the government office is slow in building apartments for its people翻译,be slow in doing sth 是固定短语吗, to be slow in coming;to be 用be interested in doing 造句 be occupied in doing be behind in doing sb spend time mony in doing sth还有be finish doing 为啥要用doing... be expert at doing 还是in doing sb spend some time in doing sthsb.spend st./sm.(in) doing sth.造句 spend st in doing sth存在吗打错了，是spend sm in doing sth be in charge of doing be interested in doing sth be busy in doing sth be long in doing sth be behind in doing sth be sophisticated in doing sth 可不可以用be doing,when be doing? be busy doing 和 be busy in doing 的区别?