—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． once |
| C． if | D． where |
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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． once |
| C． if | D． where |
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