问题
选择题
Sit down, Emma. You will only make yourself more 
tired, ________ on your feet.[ ]
A. to keep
B. keeping
C. having kept
D. to have kept
答案
答案：B
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Sit down, Emma. You will only make yourself more tired, ________ on your feet.[ ]
A. to keep
B. keeping
C. having kept
D. to have kept
答案：B