单选题The look-out must be able（）full attention to the（）of a proper look-out．Ato give/keepBgiving/keepingCgiving/keepDto give/keeping
单选题
The look-out must be able（）full attention to the（）of a proper look-out．
A
to give/keep
B
giving/keeping
C
giving/keep
D
to give/keeping
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