Tom often surfs on the internet,no()he fell far behind the o

Tom often surfs on the internet,no(C)he fell far behind the others in his class.
A.doubt B.idea C.wonder D.problem
no wonder 难怪...的意思
汤姆经常上网,难怪他的成绩落后于班上其他同学.
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再问： 为什么不选A
再答： There is no doubt that.... 这么用才可以 毫无疑问的......