1.The river is about 10 meters deep.（对划线部分提问） —————————— ___ ___ is the river?

1.The river is about 10 meters deep.（对划线部分提问） —————————— ___ ___ is the river?

How deep
that

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_How__ _deep__ is the river?
This is the tree _which__ he planted 3 yeats ago.