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To play basketball and to go swimming ______ useful for charactertraining. A. was B. is C. are D. were C 由and 连接并列的非谓语动词作主语，如果两个不属于同一概念谓语动词就用复数，如果属于同一概念谓语动词就用单数。此句and 连接两个不同概念的不定式，因此用复数。 1. 用and连接并列主语，谓语动词通常用复数形式。但是如果并列主语指的是同一个人，同一事物或同一概念时，如bread and butter; soda and water; coffee and water; aim and end; salt and water等，谓语动词用单数形式。 2. the＋n1＋and＋n2指同一个人，如the writer and painter, 谓语动词用单数形式。 3. and 所连接的两个名词前分别有every, each, no, many a 等修饰时，谓语动词用单数形式。 4. 主语是连接词or, either…or…， neither…nor…， whether…or…， not… but…， not only…but also…等连接的名词或代词时，谓语动词的形式须与最接近的名词或代词保持一致。 5. 主语是“A＋ with / as well as / along with / together with / like / rather than / except / but / including / plus / besides / in addition to＋B”结构时，谓语须与A保持一致。 6. more than one＋名词单数；a＋名词单数＋or two等作句子的主语时，谓语动词用单数形式。 【考点4】 “the＋形容词或分词”作主语 | 
