问题描述：
[单选]
The fuel injector injects a fine spray of fuel into the hot air and combustion（）， producing much high pressure in the gases．
A．has begun
B．takes place
C．occurs
D．happe
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答案解析：无
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答案解析：无
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上一篇：The fuel injector pump is operated by（）which drives the plunger up and down．
下一篇：The fresh air coming in through the inner air ports， is compressed by（）to a higher pressure．
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