A
on and up 没有这个说法
如果用about就应该直接跟时间,而不会中间加个for
at least,至少.道理同about
所以选off and on: adv.断断续续地
how long have you lived in Germany?__for the past six years.
how long have you lived in Germany?__for the past six years.
A.off and on B.on and up C.about D.at least
A.off and on B.on and up C.about D.at least
英语人气：871 ℃时间：2020-06-01 06:41:28
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