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

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

A.Even

B.It is

C.Even though

D.There is

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。