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-I don't know ________ he will come tomorrow.

-Don't worry.________ he comes, I'll let you know.


  1. A.
    whether, If
  2. B.
    if, Whether
  3. C.
    when, Whether
  4. D.
    that, If
A
这里的语境为:“我不知道明天他是否会来.”“别担心,如果他来了,我会告诉你的.”
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