—Please go on with your demonstration．
—But where was I?
—Well, you_____the two chemicals together．
| A．tried to mix | B．were trying to mix |
| C．were trying mixed | D．had tried to mix |
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—Please go on with your demonstration．
—But where was I?
—Well, you_____the two chemicals together．
| A．tried to mix | B．were trying to mix |
| C．were trying mixed | D．had tried to mix |
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