【题目】Now that you have practiced a lot, therebe any difficulty in performing well.
A.mustn't
B.shan't
C.shouldn't
D.needn't

【答案】C
【解析】句意：既然你已经练习了很多次，那么表现好就应该不会有困难。A禁止；B是shall not的缩写，表示“将不做”；C不能，不应该；D不需要。表示否定意义的推测shouldn't，故选C。