问题
选择题
In _____ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.
A．the; the
B．a; ∕
C．∕; a
D．the; a
答案
答案：C
in preparation for 固定搭配；a knowledge of 某一门知识，这个时候可数。
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