填空题

Fred was playing the piano while Mary and I (sing)（）

【参考答案】

were singing

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单项选择题

What can we learn from the conversation（）

A．It’ s quiet in the restaurant.
B．The price is high in the restaurant.
C．The restaurant serves good food.
D．The restaurant is too far from their school.

填空题

Unless he (tell)（）us who he is, we won’ t let him in.