When we start gazing into the night sky with a telescope, soon we’ll be astonished by the realization _______ we and our world are part of this giant system.
A．whichB．whetherC．thatD．a(chǎn)s
C
考查同位語從句。we and our world are part of this giant system.是realization的同位語，that在從句中不做成分。
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