The astronauts were so struck by ______beauty of nature that they took lots of pictures in _______space. 
21.
| A．the ; / | B．the; the | C．/; the | D．/;/ |
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The astronauts were so struck by ______beauty of nature that they took lots of pictures in _______space. 21.
| A．the ; / | B．the; the | C．/; the | D．/;/ |
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