单选题 Every boy and every girl knows that each day and each hour brings their duty.
  • A. and
  • B. knows
  • C. brings
  • D. their


【正确答案】 D
【答案解析】[解析] their→his/her。用every修饰的名词后面的动词用单数形式，所以也应该把表示复数的their改成his/her。