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 |
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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 |