---________ it be Li Ping who broke the glass?

---No．It ________ be Wu Dong who did it．


  1. A.
    Can; must
  2. B.
    Must; can
  3. C.
    Must; must
  4. D.
    May; need
A
表示對(duì)現(xiàn)在情況的肯定推測(cè)應(yīng)用must，在疑問句和否定句中則用can和can’t。本題是一般疑問句，故用can。答句中已對(duì)李平打破玻璃作了否定說明之后，進(jìn)一步用肯定的口氣說明肯定是吳東做了此事，所以用must。
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