单选题In a planned economy it was often difficult to secure spare parts,Aso many companies manufacture them all by themselves.Bso many companies have to stop the production lines while waiting.Cso many companies place large orders for emergencies.Dso many companies feel quite headache about this problem.
单选题
In a planned economy it was often difficult to secure spare parts,
A
so many companies manufacture them all by themselves.
B
so many companies have to stop the production lines while waiting.
C
so many companies place large orders for emergencies.
D
so many companies feel quite headache about this problem.
参考解析
解析：
第三段中提到“In a planned company, it was often difficult to secure spare parts and so many…to produce ”，由此可知答案选C。
第三段中提到“In a planned company, it was often difficult to secure spare parts and so many…to produce ”，由此可知答案选C。
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