His ideas are invariably condemned as______by his colleagues.
A、
imaginative
B、
ingenious
C、
impractical
D、
theoretical
【正确答案】
C
【答案解析】
从空格前的condemn(谴责)可知此处应为impractical“不切实际的”，如：Refloating the sunken ship proved impractical because of the great expense．(打捞沉船由于费用巨大而显得不切实际。)
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