it spent half an hour working out the pysics problem.(保持原意）

题目

it spent half an hour working out the pysics problem.(保持原意）
it ______ half an hour _____ him _____ _______out the physics problem.
the physics problem________him half an hour
it takes sb.sometime to do sth.不是固定搭配么？为什么能用take ...for?
还有spent的主语不是人么？it 后应该不能用spent吧？

答案

tooks/for/to work costedit takes sb.sometime to do sth的确是固定搭配.这里的 for 不是跟take搭配着当词组用的.你可以把它当做一个插入语就像你可以把to me,it is important to do this 写成it is important for ...