China has been preparing to send some space laboratories into ____ space for its plane to build ____ space
station in 2020.

A. the; a
B. /; the
C. /; a
D. the; the
C
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China has been preparing to send some space laboratories into ____ space for its plane to build ____ space
station in 2020.
[     ]
A. the; a
B. /; the
C. /; a
D. the; the

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