______relatively costly , the engine is highly efficient and needs servicing infrequently.

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问题 ______relatively costly , the engine is highly efficient and needs servicing infrequently.

选项 A、Even
B、It is
C、Even though
D、There is

答案C

解析 分析句子结构可知,后半句的句子成分完整,所以前半句在句中充当状语的成分,可首先排除选项B、D;even:甚至,还;even though:虽然,即使,尽管。根据句意可知,选C。
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