2. 外语
  3. Treatments that______the immune system have shown great promise against some forms of cancer.

Treatments that______the immune system have shown great promise against some forms of cancer.

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问题 Treatments that______the immune system have shown great promise against some forms of cancer.
选项 A、proceed
B、erode
C、harness
D、precede
答案C
解析 该句意为：利用免疫系统的治疗方法(免疫疗法)有望能有效治疗某些癌症。proceed：继续，接着做……，发展；erode：腐蚀；harness：控制，利用(能源)；precede：在……之前。
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