单项选择题

A．The class thought the demonstration was too complex.
B．Too many students showed up.
C．The professor didn’t show up,
D．The professor cancelled it.
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[A] Although [C] Unless[B] If [D] Until
A．Although
B．If
C．Unless
D．Until
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[A] part [C] chapter[B] entirety [D] section
A．part
B．entirety
C．chapter
D．section
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