13. Doctors see a connection between increased amounts of leisure time spent___________and the increased number of cases of skin cancer.
(A) to sunbathe
(B) to have sunbathed
(C) having sunbathed
(D) sunbathing

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統計： A(0), B(1), C(0), D(0), E(0) #3363554

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13. Doctors see a c...
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