The men work all week in the factory, and at the end of the week they get their pay. Natur

ally enough, they open the envelopes and they all count the money. One man is standing in the comer. He's counting his money. Suddenly he realizes that it is wrong. He counts the money again. No doubt about it--there is a mistake. There is too much. Five pounds too much. He puts his money carefully in his pocket and says nothing to the others. A week goes by. It's payday again. The men ate counting their pay. The same man is standing in the comer. Suddenly he starts shouting. This time there isn't enough money in his envelope. It's five pounds short. He goes immediately to see the boss. He is very angry.

"Look," he says, "there isn't enough money in my pay envelope." 'What's right," says the boss. "But didn't you notice last week？ There was a mistake. There was too much. Fiver pounds too much." "Yes, that's right," says the man (he is very angry). There was a mistake last week. For one mistake, I can shut my eye--but for two mistakes, no, I can't."

The men get their pay ______.

A．once a month

B．twice a month

C．once a week

D．every five days