题目内容

When Tom was a child, he always wondered ________ and asked his mother a lot of questions.


  1. A.
    how did things work
  2. B.
    how do things work
  3. C.
    how things work
  4. D.
    how things worked
D
因为本句wonder后面跟宾语从句,必须跟肯定句形式,即“how+主语+谓语”,而“how things worked”符合这条规定,所以正确答案是D.
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