______are Young Pioneers.A.They all B.All them C.All they D.All of them (选择

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______are Young Pioneers.A.They all B.All them C.All they D.All of them (选择
______are Young Pioneers.A.They all B.All them C.All they D.All of them (选择

______are Young Pioneers.A.They all B.All them C.All they D.All of them (选择
D