单项选择题

The directors of the museum have realized______.

A．visitors prefer to learn from museums
B．people learn best when they look at something
C．people can learn better if they take a part
D．the importance of scientific roles

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单项选择题

I'll make______Mark was once a good singer.

A．it known as all that
B．it known to all that
C．that known to all that
D．that known to all

单项选择题

When I got off the subway, a golden watch on the ground______my eye.

A．noticed
B．attracted
C．caught
D．met