8.(2015常州，7)—JennywillyouleavefortheUSAnow?—No.ItwillbetwoweeksIleavehere.A.untilB.sinceC.beforeD.when
8. ( 2015 常州，7) —Jenny will you leave for the USA now?
—No.It will be two weeks I leave here.
A. until B. since C. before D. when
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数学数列列项相消法1/1*5+1/3*7+1/5*9+.1/(2n-1)(2n+3)这样的数列,把它 2020-12-23 …