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
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正确答案
试题解析
第三段首句指出“In a planned company, it was often difficult to secure spare parts and so many companies ordered many extra parts and kept large supplies of parts so that if a mistake was made in planning, they could continue to produce.”,由此可知许多企业订购大量多余零部件以备不时之需,因此选项C符合题意。