单项选择题

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

A. what
B. which
C. that
D. everywhere

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单项选择题
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
单项选择题
We have done things we ought to have undone and （） undone things we ought to have done.

A. leaving
B. left
C. will leave
D. leave
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