In ______ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.
- A.
the; the
- B.
a; ∕
- C.
∕; a
- D.
the; a
C
in preparation for 固定搭配；a knowledge of 某一門(mén)知識(shí)，這個(gè)時(shí)候可數(shù)。
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