Among the many open research questions on MTBE are how it is metabolized, ______

游客2025-05-09 61

问题 Among the many open research questions on MTBE are how it is metabolized, ______the levels of exposure in the general population are.

选项 A、but what
B、and what
C、but how
D、and why

答案 B

解析需要 what 从句结构。

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