13、Those who are potential customers will certainly be reassured to learn that a case covered in rubies and diamonds is included free ________ charge.
A.
from
B.
to
C. in
D. of
科目：高中英语 来源： 题型：
Those who are potential customers will certainly be reassured to learn that a case covered in rubies and diamonds is included free ________ charge.
A. from B. to C. in D. of
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