家畜在脱毛期，家禽在换羽期应注意补饲的是（）。
A、含磷饲料
B、含钙饲料
C、含硫饲料
D、含锰饲料
参考答案：C
．The letter Mary had looked forward to ____her last night and she was very excited．
A．reached
B．reaching ’
C．had reached
D．has reached
