______relatively costly, the engine is highly efficient and needs servicing infr

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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

解析这是一道语法题，考点是句子前后连接的逻辑关系。

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【B1】[br]【B2】A、apparentlyB、naturallyC、efficientlyD、sufficientlyB词义辨析。appare