---Mary is very clear and studies very hard.
---______ she stands out in almost all her subjects that she learns.A.No doubtB.No problemC.No wayD.No wonder
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D解析考查词组：A.No doubt毫无疑问，B.No problem没问题，C.No way 没门D.No wonder难怪，句意：-玛丽很聪明学习很努力，难怪所以的科目她都那么突出。选D。