, the subject was always in my mind.
A. Walking or sleeping
B. Walking or slept
C. Having walked or slept
D. To walk and sleep
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(答案→)A. Walking or sleeping
B. Walking or slept
C. Having walked or slept
D. To walk and sleep
解析:题意为“无论是走路还是睡觉,我总是在想这个问题。”注意:此题中-ing形式短语的逻辑主语与句子的主语并不一致,有的语法家称其为“垂悬分词”。又如:Having suffered such heavy pollution already, it may now be too late to clean up the river. (NMET2001)