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During the ten-day vacation, they traveled to France their own expense

A. on         B. with         C. at         D. in

During the ten-day vacation, they traveled to France their own expense

A. on         B. with         C. at         D. in

During the ten-day vacation, they traveled to France their own expense

A. on         B. with         C. at         D. in

During the ten-day vacation, they traveled to France ______their own expense.

A. on         B. with         C. at         D. in

During the ten-day vacation, they traveled to France their own expense

A. on         B. with         C. at         D. in