When Tom was a child, he always wondered ________ and asked his mother a lot of questions．
A.howdidthingsworkB.howdothingsworkC.howthingsworkD.howthingsworked...
A. how did things work
B. how do things work
C. how things work
D. how things worked 展开
B. how do things work
C. how things work
D. how things worked 展开
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答案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．
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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