单项选择题

______ matter in one form is transmuted to another form, a phase change is said to have taken place.

A．Such
B．Then
C．Whenever
D．Seldom
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单项选择题
______ you return those books to the library immediately, you will have to pay a fine.
A．Until
B．If
C．Unless
D．Provided
单项选择题
Prisons in some countries are short of staff, ______ means each prison officer is overworked and underpaid.
A．which
B．this
C．what
D．it
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