Whether you can pass the Central Conservatory of Music piano exam depends on many factors, including the difficulty of the exam repertoire, the candidate's performance level, the judges' criteria, etc. Generally speaking, missing a sentence may affect the candidate's performance score, but whether the candidate can pass the test depends on the specific situation.

In China, the Central Conservatory of Music piano examination is divided into ten levels, and each level has different examination requirements and difficulty standards. In the exam, candidates are required to perform a repertoire within the prescribed range, including etudes, sonatas, music pieces, etc. The judges will score based on the candidates' performance skills, musical sense, expressiveness and other aspects.

If the candidate misses a sentence during the performance, it may affect the judges' evaluation of the candidate's performance level. However, if the candidate performs very well in other areas, he or she may be recognized by the judges and still pass the exam.

In short, whether the candidate can pass the piano exam depends on the overall performance of the candidate. If the candidate's performance in multiple aspects meets the judges' requirements, then it is possible to pass the exam even if he misses a sentence.