He didn’t know _______ next, so he asked his teacher for help.
| A．how to do | B．what to do it |
| C．how to do with it | D．what to do |
He didn’t know _______ next, so he asked his teacher for help.
| A．how to do | B．what to do it |
| C．how to do with it | D．what to do |
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