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
They lost their way in the forest, and ______ made matters worse was that night began to fall.
A．that
B．what
C．it
D．which
单项选择题
We had difficulties at first but everything worked ______ smoothly in the end.
A．off
B．out
C．away
D．up
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