单项选择题

Our students are free to study（）interests them.

A.that
B.which
C.whatever
D.anything

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单项选择题
What happens when sea water touches different elements（）another subject of study.

A、 are
B、 is
C、 have been
D、 was
单项选择题
On no account（）be removed from the library.

A、 reference books may
B、 may reference books
C、 can't reference books
D、 reference books can
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