—Was it by cutting down staffare not diligent enoughshe saved the firm?—No, it was by impr

—Was it by cutting down staff are not diligent enough she saved the firm?
—No, it was by improving work efficiency．
A. that; when
B. that; what
C. who; how
D. who; that

A. that; whenB. that; whatC. who; how(答案→)D. who; that解析：考查复杂句：第一空填who，引导定语从句，先行词是staff，定语从句中缺少主语，用who引导定语从句，第二空填that，是强调句，强调的是by cutting down staff，句意：是通过

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