高一英语问题(就一道选择但要清楚的分析)
_____sure,youhavereadthebookbefore.
ATobeBBeingCBeDBeen
补充一提:二题都要回答
Willthose_____thechildrenfromabroadcometotheheadmaster'soffice.
AteachingBteachCwhoteachesDwhoteaching
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