While the alien _______ a souvenir, the girl called the police.


  1. A.
    was buying
  2. B.
    bought
  3. C.
    buys
  4. D.
    is buying
A
考查點(diǎn)：動(dòng)詞時(shí)態(tài)。解題思路：while一般情況下引導(dǎo)過去進(jìn)行時(shí)。
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