23．— What’s that terrible noise．David?
— Oh，I forgot to tell you．The new machines in the nearby plant _______．
| A．were tested | B．will be tested | C．are being tested | D．have been tested |
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23．— What’s that terrible noise．David?
— Oh，I forgot to tell you．The new machines in the nearby plant _______．
| A．were tested | B．will be tested | C．are being tested | D．have been tested |
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