★ Adverb and Noun Clauses
When ………………. is not known.
A. was the wheel invented
B. the invention of the wheel
C. inventing the wheel
D. the wheel was invented
Preview next quiz:
Art critics do not all agree on what ______ a painting great.
A. qualities make
B. are the qualities for making
C. qualities to make
D. do the qualities that make
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