all the students in his class，Xiao Ming writes.A. Of；very carefullyB. In；the most carefull

all the students in his class，Xiao Ming writes .
A. Of；very carefully
B. In；the most carefully
C. Of；most carefully
D. In；much more carefully

A. Of；very carefullyB. In；the most carefully(答案→)C. Of；most carefullyD. In；much more carefully解析：此题重点考查介词及副词最高级，of all是“在所有的...当中”根据比较的范围，该句要用最高级，而且副词修饰动词write，排除B、D，副词最高级可以省略the故选C

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