—I don’t know ______ with this problem. It’s too hard. —You can ask Mr Wang for help.
| A．which to deal | B．when to deal | C．what to deal | D．how to deal |
—I don’t know ______ with this problem. It’s too hard. —You can ask Mr Wang for help.
| A．which to deal | B．when to deal | C．what to deal | D．how to deal |
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