some students spend free time reading books,_____some playing computers gamed too much.A.andB.whileC.orD.then

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some students spend free time reading books,_____some playing computers gamed too much.A.andB.whileC.orD.then

some students spend free time reading books,_____some playing computers gamed too much.A.andB.whileC.orD.then
some students spend free time reading books,_____some playing computers gamed too much.
A.and
B.while
C.or
D.then

some students spend free time reading books,_____some playing computers gamed too much.A.andB.whileC.orD.then
B
while连接的前后两个句子,表示对比