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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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
In addition, teaching staff is willing （）extra help if a student needs.

A、 providing
B、 provide
C、 provides
D、 provided
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