单项选择题

I have several exercise videos, ______ are ridiculously tough.

A. whose some
B. some of what
C. some of them
D. some of which
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单项选择题
______ in the notion of a game is that of taking a risk, and one bases one's decision on what it will cost if one loses.
A. Implicit
B. Internal
C. Profound
D. Abundant
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