should 是情态动词,不能单独存在,后面必须跟实意动词spend,spend才是真正意义上的谓语
spend的直接作用对象是20分钟,即花费（时间）,所以20分钟是宾语,而”在这个任务上”是限制时间的,表示时间的用途,所以叫做宾语补足语.所以第二问分别为宾语和宾语补足语
英语问题,求高手解答!You should spend about 20 minutes on this task.问题
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