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.
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正确答案
试题解析
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。