Look! A crowd of people over there. Go and see what ________ and if it is a bargain, take it.
| A．was selling | B．was being sold | C．is selling | D．is being sold |
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Look! A crowd of people over there. Go and see what ________ and if it is a bargain, take it.
| A．was selling | B．was being sold | C．is selling | D．is being sold |
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