2. 外语
  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、There is
D、Even though
答案D
解析 本题考查让步状语从句。句意：尽管价格相对较高，但这种发动机效率高，不需要频繁维修。逗号后是完整的句子，缺少的可能是从句或状语的一部分，选项B和选项C是主谓结构，故排除。选项A是副词，意为“甚至”，放在句中讲不通。逗号前是省略了主谓语it is的状语从句，选项D是“尽管”的意思，符合题意。还需注意的是costly是形容词而不是副词。故本题选D。
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