If a tiny computer is placed inside the man's body, it can keep his heart ________.


  1. A.
    beats
  2. B.
    beating
  3. C.
    to beat
  4. D.
    beat
B
解析：
keep+賓語+v. -ing表示“使某個(gè)動(dòng)作持續(xù)進(jìn)行”。
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