问题
选择题
There is no doubt _____ China has made rapid progress in space exploration.
A． whether
B． that
C． which
D． who
答案
答案：B
句型：There is no doubt that 毫无疑问，这也是一个同位语从句，句意：毫无疑问中国已经在太空探索中取得了快速进步。所以选B。
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