It will be at least three weeks________ he recovers from his illness and returns to work.


  1. A.
    before
  2. B.
    when
  3. C.
    since
  4. D.
    after
A
考查固定句型。It be 一段時(shí)間before從句，意為：一段時(shí)間以后某事才發(fā)生。句意：至少3個(gè)星期以后他才從疾病中恢復(fù)重新回到工作崗位上。
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