单项选择题

To do a task promptly is better than（）about it.

A．worry
B．to worry
C．worried
D．worrying

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单项选择题

（）from space, our earth, with water covering 70% of its surface, appears as a blue planet

A．Seeing
B．To be seen
C．Seen
D．Having seen

单项选择题

I understand you are third year students（）in economics.

A．majored
B．to major
C．major
D．majoring

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