What ( ) are you doing You have been sitting there for four hours .A ,on earth B in earth,C .on the earth D in the earth

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What ( ) are you doing You have been sitting there for four hours .A ,on earth B in earth,C .on the earth D in the earth
What ( ) are you doing You have been sitting there for four hours .
A ,on earth B in earth,
C .on the earth D in the earth

What ( ) are you doing You have been sitting there for four hours .A ,on earth B in earth,C .on the earth D in the earth
A
on earth究竟的意思