To be changing times you cannot have your body in the 21st century and your head back in the past.
A. in step with
B. in front of
C. together with
D. apart from
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(答案→)A. in step with
B. in front of
C. together with
D. apart from
解析：考察介词短语辨析。A与…协调，与…一致；B在…前面；C与…一起；D除…之外；句意：为了跟上不断变化的时代，你不可能把你的身体和你的思想回到过去。根据句意说明A正确。