题目内容
—Look! The lights in the classroom are still on.
—Oh, I forgot ________.
A. turning them off B. turn them off
C. to turn them off D. having turned them off
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题目内容
—Look! The lights in the classroom are still on.
—Oh, I forgot ________.
A. turning them off B. turn them off
C. to turn them off D. having turned them off