.in doing .(IN ) doing 的有关词组多写几个,

have fun in doing absorb sb in doing interest in doing something be occupied in doing waste time in doing doing business in be behind in doing involve in doing The pupils here ______ all kinds of exercises every day in the past four weeks.A.kept busy doing The pupils here_all kinds of exercises every day in the past four weeks.A.kept busy doing B.keep on doingC.have kept busy doing D.have been kept busy doi be expert at doing 还是in doing practice in doing 和practice doing 区别 spend in doing还是 on doing be successful in doing in可省吗 have difficulty in doing sth .have trouble in doing sth spend ...in doing sth这个in doing sth是什么语? .in doing .(IN ) doing 的有关词组多写几个, sb have trouble (in) doing have fun( in) doing sth