duing the spring,some birds ___ the north of china1.go back 2.fly to 3.fly back4.back for

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duingthespring,somebirds___thenorthofchina1.goback2.flyto3.flyback4.backforduingthespring,somebirds_

duing the spring,some birds ___ the north of china1.go back 2.fly to 3.fly back4.back for
duing the spring,some birds ___ the north of china
1.go back 2.fly to 3.fly back4.back for

duing the spring,some birds ___ the north of china1.go back 2.fly to 3.fly back4.back for
选b
fly to 飞到
如果c的话要这样,fly back to