A person such kind of work must be careful enough, an eye on any sign of the possible resu

A person such kind of work must be careful enough, an eye on any sign of the possible result .
A. to do ; to keep
B. doing ; keeping
C. to do ; keeping
D. doing ; to keep

A. to do ; to keep(答案→)B. doing ; keepingC. to do ; keepingD. doing ; to keep解析：前一空用现在分词用定语，相当一个定语从句，后一空用现在分词做状语。

我也是这个答案

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