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—I saw Betty go to Grandpa Li's home just now．

—Yes．She's often seen         the old man with the housework．

A．help           B．to help           C．helps           D．helped

---I saw Betty       to Grandpa Li's home just now.
---Yes. She’s often seen _________ the old man with the housework.

---I saw Betty       to Grandpa Li's home just now.

---Yes. She’s often seen _________ the old man with the housework.

A．go, help           B．going, to help       C．go, to help         D．going, helps