By 11 o’clock,he will ____ for four hours.

By 11 o’clock,he will ____ for four hours. By 5 o'clock,he ＿＿(work)in the field for 6 hours. the meeting will last for two hours.it will e_ at four o'clo we must be home by four o'clock是什么意思? 不定式 省略toRober will collect us by 10 o'clock,he promise (to)i he skated for four hours 为什么加for four-o'clock They will leave for America ______ four hours. she waited for me (until four o'clock). he`s been skating for four hours 改为否定句 It will take four seconds four o'clock to strike five how ma he has to be ____ bed ___ nine o'clock A、at;at B、to;by C、in;