—Could you tell us _________ to do it?
—Of course. First of all, you should clean the wall, then clean the floor.
| A．when | B．what | C．how | D．whether |
—Could you tell us _________ to do it?
—Of course. First of all, you should clean the wall, then clean the floor.
| A．when | B．what | C．how | D．whether |
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