Research marches onward, but we’re still______something as simple as the flu.A、i

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问题 Research marches onward, but we’re still______something as simple as the flu.

选项 A、in the course of
B、with the exception of
C、on the brink of
D、at the mercy of

答案 D

解析本题考查介词短语的含义。A在……过程中；B除……之外；C在……的边缘；D任凭……摆布。该句的大意为：研究不曾止步，而我们对类似流感这般简单的疾病仍然难以控制。

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