makes a new invention such a wonderful thing is it allows us to do something we could not do before.
A. What; what; what
B. That; that; \
C. What; that; \
D. That; what; that
网友回答
A. What; what; what
B. That; that; \
(答案→)C. What; that; \
D. That; what; that
解析：考查从句。 makes a new invention such a wonderful thing是主语从句，且从句缺少主语，用what引导，排除B,D; it allows us to do something是表语从句，且不缺成分，所以用that引导；something是不定代词作先行词，在定从 we could not do before中作do的宾语，用that引导，也可省略。所以选C。