Due to the light pollution, stars are too faint _________with naked eyes in the urban area.
| A．observing | B．being observed |
| C．to be observed | D．to be observing |
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Due to the light pollution, stars are too faint _________with naked eyes in the urban area.
| A．observing | B．being observed |
| C．to be observed | D．to be observing |
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