—Look，the paint is starting to come off ________the wall is damp.
—Well，we’d better have the wall repainted some day.
| A．when | B．where | C．if | D．once |
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—Look，the paint is starting to come off ________the wall is damp.
—Well，we’d better have the wall repainted some day.
| A．when | B．where | C．if | D．once |
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