It is an abundance of cheap goods and quick delivery service ______ account for the fact that the number of Internet shopping on this website is four times ______ it was last year.A.that; thatB.which; whatC.what; thatD.that; what
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D解析考查强调句型和表语从句。第一空that与it is构成强调句型，强调主语an abundance of cheap goods and quick delivery service.第二空是表语从句的引导词，what引导起这个表语从句，并在句中做表语，实际上也是一个倍数表达法。