Heart______is much more common these days than it was even ten years ago.

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问题 Heart______is much more common these days than it was even ten years ago.

选项 A、surgery
B、surgeon
C、work
D、circulation

答案A

解析 词义辨析A.surgery外科(学), (外科)手术;B.surgeon外科医生;C.work工作,职业;D.circulation循环,流通;因此A为答案。
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