A doctor should examine the patient to ______ where the pain is localized.

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问题 A doctor should examine the patient to ______ where the pain is localized.

选项 A、alienate
B、alternate
C、allocate
D、ascertain

答案D

解析 动词辨义。这四个选项都是动词,alienate表示“离间;使疏远”;alternate表示“(常与with连用)(使)轮流;(与between连用)(使)交替”;allocate意指“(常与to连用)分配;配给”;ascertain表示“发现;查明;确定”。根锯句意,医生首先要确诊,然后才能看病,所以选D)。
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