单项选择题

________ under a microscope, a fresh snowflake has a delicate six-pointed shape.

A．Seeing
B．Seen
C．To see
D．To be seen
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单项选择题
The question_________ at the meeting tomorrow is very important.
A．to discuss
B．being discussed
C．to be discussed
D．will be discussed
单项选择题
In no case_________ the students from exploring new ideas.
A．we should prevent
B．we could prevent
C．should we prevent
D．shouldn’t prevent
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