the exploration of the botanical world on a large scale.
A. It was not until the eighteenth and nineteenth centuries that; had begun
B. It was not until the eighteenth and nineteenth centuries when; began
C. Not until the eighteenth and nineteenth centuries did; begin
D. Until the eighteenth and nineteenth centuries; began
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A. It was not until the eighteenth and nineteenth centuries that; had begun
B. It was not until the eighteenth and nineteenth centuries when; began
(答案→)C. Not until the eighteenth and nineteenth centuries did; begin
D. Until the eighteenth and nineteenth centuries; began
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