未知题型 Lack of confidence is the biggest ________ to his success.A barrierB obstacleC flawD drawback

未知题型 She had regular treatment ________ for the next two years, and was still making progress.A sessionsB processionsC specificationsD procedures

未知题型 When I finally succeeded in making the letters correctly I was ________ with childish pleasure and pride.A consumingB overwhelmingC flushedD overflowed