The physics teacher once said that we first _________ the lightning followed by thunders because light _________ faster than sound．


  1. A.
    see; travelled
  2. B.
    saw; travelled
  3. C.
    saw; travels
  4. D.
    see; travels
C
解析：
第一個空用saw與主語的時態(tài)一致；
第二個表示客觀真理，仍然要用一般現(xiàn)在時。
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