单项选择题

Would you mind ________ quiet for a moment, I’m trying ________ my composition in time.

A．keeping; finishing
B．to keep; to finish
C．keeping; to finish
D．to keep; finishing
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单项选择题
She is the only one among the girls who ________ to experiment with snakes.
A．are courage enough
B．is courage enough
C．have enough courage
D．has enough courage
单项选择题
________ from space, our earth, with water covering 70% of its surface, appears as a “blue planet”.
A．Seen
B．Seeing
C．Having seen
D．To see
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