B
名词前有every等修饰时不用介词
twice a week 一周两次 (根据星期二‘ 一次’ 和星期五‘一次’ 可知)
We have PE lessens___every Tuesday and Friday.so wehave them___ a week
We have PE lessens___every Tuesday and Friday.so wehave them___ a week
A on;two times B /;twice C on;twice D /;two times
A on;two times B /;twice C on;twice D /;two times
英语人气:510 ℃时间:2020-03-28 09:42:48
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