They often help the old man (clean the room.)就括号内提问 ___ ____they often help the old man ____?

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They often help the old man (clean the room.)就括号内提问 ___ ____they often help the old man ____?
They often help the old man (clean the room.)就括号内提问 ___ ____they often help the old man ____?

They often help the old man (clean the room.)就括号内提问 ___ ____they often help the old man ____?
What do they often help the old man do?

What do....do?

What do do