2. 外语
  3. ______any trouble with the boiler, the automatic controlling unit will cut off the fuel oil supply.

______any trouble with the boiler, the automatic controlling unit will cut off the fuel oil supply.

admin2011-02-14  56
问题 ______any trouble with the boiler, the automatic controlling unit will cut off the fuel oil supply.
选项 A、There should be
B、If there had been
C、Should there be
D、If there was
答案C
解析
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