The way he did it was different we were used to .A. in whichB. in whatC. from whatD. from

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A. in which
B. in what
(答案→)C. from what
D. from which
解析：句意：他做的方法和我们习惯的方法不一样。Be different from和…不同，介词from后面接的是宾语从句，宾语从句中缺少宾语，用what引导宾语从句，选C。