It was impossible to estimate what types of costly medical advances will be______in coming years.

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问题 It was impossible to estimate what types of costly medical advances will be______in coming years.

选项 A、available
B、applicable
C、approachable
D、attainable

答案A

解析 要估计在近期会有何种高代价的医学进步是不可能的。available意为“可利用的,可得到的”,此处取“可利用的”之意;applicable“可应用的”;approachable“可接近的,随和的”;attainable“可得到的”。
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