问题描述：
填介词或副词They're treining _ the boat race
Bears can walk _ like man.It's very funny.
You can only buy one of this kind of cheap pen _ a time.
( )If you have nothing important to do,you can walk _ and enjoy yourself.
A.through B.across C.around D.upright
Bears can walk _ like man.It's very funny.
You can only buy one of this kind of cheap pen _ a time.
( )If you have nothing important to do,you can walk _ and enjoy yourself.
A.through B.across C.around D.upright
问题解答：
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