Broad sanctions that ______ Indian and Pakistani scientists from the West are a counterproductive response to the two nations’ u

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问题 Broad sanctions that ______ Indian and Pakistani scientists from the West are a counterproductive response to the two nations’ unwelcome arrival in the nuclear club.

选项 A、could isolate
B、may isolate
C、isolated
D、isolate

答案A

解析 谓语动词需要过去时情态动词 could 在句中的搭配。
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