英语天才过来four hours ———— a long time里面填IS 还是ARE

four hours is a long time为什么要用is Three hours is a long time to s_____ still . 英语试卷求答案（4.0分）— Are you going on holiday for a long time?— __ What‘s that —----- is a ruler.里面该填That还是It 求专家详解 ——you are waiting!A.How a long time B.What The cat jumped into the water and —— there for a long time.填 请教一道英语单选题!——Where is Time now?I haven't seen him for a long 1000 kilometers ______ quite a long way 这里是填is还是填are 语法冠词Are you going to do it——second time.是填the 还是a,为什么 —i haven't seen you for a long time.how are you ____ your En （ ）He ———for two years .Two years is a long time. There are _________ hours in a day.答案用twenty还是twenty-four呢?这