摘要：19．B．Good night. “晚安 .晚上分别时用语.
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—It's time to go to bed, Betty! —OK. , Mum.
A．Good morning B．Good night C．Good evening D．Good afternoon
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补全对话
A：Mary, it’ s your bed time．________
B：Oh, Mum!________ It’s Friday evening and it’s．still early．
A：Yes．Tomorrow we have to get up early to catch the train to your grandpa’s．
B：________OK, I’ll go to bed right now．
Oh, Mum, do I have to brush my teeth before I go to sleep?
A：________ And don’t forget to open the bedroom window．
B：________ Good night, Mum!
A：Good night．