It is getting dark. Take an umbrella ________ you regret it.


  1. A.
    or
  2. B.
    and
  3. C.
    even
  4. D.
    before
D
before的本意為“在……之前”，但這里含有否定的意思，表示“才不”．引導(dǎo)一個時間狀語從句．
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