题文
The incident _____ a chain of events which resulted in the outbreak of the World War I.
| A. set out |
B. set off |
| C .set about |
D. set in |
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The incident _____ a chain of events which resulted in the outbreak of the World War I.
| A. set out |
B. set off |
| C .set about |
D. set in |
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