问题标题：
()3．Thetwins＿＿＿＿＿＿inDalianlastyear．They＿＿＿＿＿＿herenow．A．are;wereBwere;()6.Icleanedmyclassroom___________.AwiththreehoursBthreehoursagoCinthreehoursDthreehoursbefore()7.Icame_______my
问题描述：
()3．Thetwins＿＿＿＿＿＿inDalianlastyear．They＿＿＿＿＿＿herenow．A．are;wereBwere;
()6.Icleanedmyclassroom___________.
AwiththreehoursBthreehoursago
CinthreehoursDthreehoursbefore
()7.Icame_______myhousetwodaysago.
A
backonBbackto
CtobackD
back
()10.Thekoalasleeps_______,butgetsup_________.
Aduringtheday;attheeveningBatday;duringnight
Cintheday;duringtheeveningD
duringtheday;atnigh
刘永生回答：
3.were；aretwins双胞胎谓语用复数.“去年他们在大连,现在在这”,所以第一个过去时,第二个现在时.
6.B.三个小时前我打扫了教室.时间段+ago=before+时间段.in+时间段表示“在多长时间内,在多长时间以后”
7.B.camebacktosp回到某地
10.D.考拉在白天睡觉,在一天的时间里,用during
在晚上,atnight/intheevening
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