A. That this is made from B. What is this made from C. This is made from D. What this is made from 参考答案:D 答案解析:此空格处的成分为全句的主语,首先排除[C]项(没有引导词);主语从句语序不倒装,排除[B]项;该主语从句的引导词同时在从句中做介词的宾语,而[A]项中连接词 that只能引导名词从句,但不能在从句中充
第20题: [单项选择]The rate of pressure rise during the period following fuel ignition in a diesel will result in () A. valve overlap B. volumetric efficiency C. turbulence of the air change D. fuel efficiency 参考答案:C