来自孙贵经的问题
Weshoulddo___wecantoprotecttheseendangeredspeciesbeforetheydieout.A.thatB.allthatC.allwhatD.which
Weshoulddo___wecantoprotecttheseendangere
dspeciesbeforetheydieout.A.thatB.allthatC.allwhatD.which


Weshoulddo___wecantoprotecttheseendangeredspeciesbeforetheydieout.A.thatB.allthatC.allwhatD.which
Weshoulddo___wecantoprotecttheseendangere
dspeciesbeforetheydieout.A.thatB.allthatC.allwhatD.which
C
有疑问,