问题描述：
he always wondered -------- and asked his mother a lot of questions
1.how did things work
2.how things work
3.how things worked
4.how worked the things are
说一下原因,为什么选他
1.how did things work
2.how things work
3.how things worked
4.how worked the things are
说一下原因,为什么选他
问题解答：
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