—Look, the paint is starting to come off
问题:
—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
—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