--- Are you sure you have to ? It's been very late.
--- I don't know _____ I can do it if not now.
| A．where | B．why | C．when | D．how |
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--- Are you sure you have to ? It's been very late.
--- I don't know _____ I can do it if not now.
| A．where | B．why | C．when | D．how |
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