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
（）him do this job by himself

A．Why don't let
B．Why not let
C．Why not letting
D．Why you not let
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