.on Monday mornings,在星期一上午。
morning用复数形式是表示经常性的情况,它前面有修饰词Monday,所以介词要用on。.One Monday, there were fewer people in the shop than usual when the woman came in, so it was easier for the detective to watch her.有一个星期一,当这位妇女走进这家商场时,里面的人比往常少,因此,侦探比较容易监视她。
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