单项选择题

（） I admit that there are problems, I don’t think that they cannot be solved.

A. Unless
B. Until
C. As
D. While

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They tried to restrict access to（）they believed to be dangerous areas.

A. what
B. which
C. that
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Water enters into a great variety of chemical reactions, （） have been mentioned in previous pages.

A. a few of it
B. a few of that
C. a few of them
D. a few of which
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