he has been working very hard.he is an advanced worker.

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he has been working very hard.he is an advanced worker.
What do you think of tom?
He has been working very hard.______he is an advanced worker.
A,No wonder B.No doubt C.No worry D.No problem
为什么是选A,而不是选B.翻译过来不是应该是无疑（B)更加正确吗?no wonder 是一个先进的员工不太对吧?

NO wonder难怪,可以放在句首
no doubt 不能放在句首,通常放在句首时是用There's no doubt that 毫无疑问
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