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

______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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