18．In this experiment, they are woken up several times during the night, and asked to report what they _______.
| A．are dreaming | B．had dreamt |
| C．had been dreaming | D．have been dreaming |
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18．In this experiment, they are woken up several times during the night, and asked to report what they _______.
| A．are dreaming | B．had dreamt |
| C．had been dreaming | D．have been dreaming |
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