_____ all the inventions have in common is ______ they have succeeded.<br />A. What; what <br>B. That; what<br>C. What; that <br>D. That; that

_____ all the inventions have in common is ______ they have succeeded.
A. What; what
B. That; what
C. What; that
D. That; that

出自：国家开放大学英语语法

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