单项选择题

Doctor warned sun-starved tourists who received too much sunlight that they were at _______ risk than others of contracting skin cancer.

A. most
B. more
C. greater
D. seriously
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We cannot see any possibility of business ________ your price is on the high side of the prevailing market trend.
A. which
B. though
C. that
D. since
单项选择题
I cannot thank you ____________ much of your kindness, I owe my success to you.
A. so
B. very
C. too
D. as
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