{01} _ the Smiths will come or not is she is worrying about. A.What; that B.Whether; what C.If; that D.How; which 解析: 本题选B。
{02}How did your brother make such a stupid mistake ______ he had a such a good knowledge of the steps and cautions over operating the machine. [ ] A. when B. because C. while D. that 解析: 本题选A。
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