1、I spent half an hour（working on）this difficult math proble

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/11/11 15:59:11

1、I spent half an hour（working on）this difficult math problem 括号里为何填working on 而不是to wo

$1、I spent half an hour（working on）this difficult math proble$

spend 有两个用法：spend some time （in）doing sth.spend some time on sth.
It takes sb some time to do sth.
上面的区别就可以很清楚说明如何填这个空了.

1、I spent half an hour（working on）this difficult math proble I spent half an hour working out the math problem.这里的working 1.I spent half an hour______________this difficult math prob I spent half an hour on my homework yesterday.（保持原意） it spent half an hour working out the pysics problem.(保持原意） I spent half an hour on my homework yesterday.（保持原意 they spent half an hour on talk是什么基本句型 I spent half an hour ______ my homework ( ) 15.I spent half an hour ___________ my homework .finish I spent half an hour ___(finish) my homework. I spent half an hour cleaning my room.（同义句转换） This went on and on for n____ half an hour