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An awful accident, however, _____occur the other day.


  1. A.
    does
  2. B.
    did
  3. C.
    has to
  4. D.
    had to
B
解析:
此題正確答案應選B,句末的the other day意為“前幾天”,所以句子應用過去時態,而選項D填進去不合題意,故選B。此句有兩個難點:一是句中插有however一詞,分散了同學們的注意力;
二是所填選項B為許多同學所不熟悉的強調用法。
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