来自梁晓云的问题
WhenIwastryingtofindout1____1_thatpreventedsomanybirdsfromreturningtothenorth,WhenIwastryingtofindout____thatpreventedsomanybirdsfromreturningtothenorth,anunexpectedvisitorcame.A.whyitwasB.whatitdidC.w
WhenIwastryingtofindout1____1_thatpreventedsomanybirdsfromreturningtothenorth,
WhenIwastryingtofindout____thatpreventedsomanybirdsfromreturningtothenorth,anunexpectedvisitorcame.A.whyitwasB.whatitdidC.whatitwasD.whyitdid
