单项选择题

The vocabulary of any technical discussion may include words which are never used outside the subject or field __________.

A．in view
B．in case
C．in question
D．in effect
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单项选择题
There had seemed no any of tiding over the economic crisis into which we were now __________.
A．inserted
B．plunged
C．pitched
D．imposed
单项选择题
The car comes with a heater but the air conditioning is __________.
A．excessive
B．additional
C．optional
D．arbitrary
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