They usually have the medicine __________ before putting into the market all over the country.
| A．testing out |
| B．to be tested out |
| C．being tested out |
| D．tested out |
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They usually have the medicine __________ before putting into the market all over the country.
| A．testing out |
| B．to be tested out |
| C．being tested out |
| D．tested out |
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