Question

Betty ________ fake watches when the police came．

1. A.
   sells
2. B.
   is selling
3. C.
   was selling
4. D.
   has sold

Answer 1

C
因?yàn)楸揪鋾r(shí)間狀語(yǔ)是“when…”是“當(dāng)……的時(shí)候”，要用過(guò)去進(jìn)行時(shí)才最恰當(dāng)，只有“was selling”是過(guò)去進(jìn)行時(shí)，所以正確答案是C．