题文
Experiments of this kind___in both the U.S. and Europe well before the Second World War
| A．have conducted |
| B．have been conducted |
| C．had conducted |
| D．had been conducted |
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Experiments of this kind___in both the U.S. and Europe well before the Second World War
| A．have conducted |
| B．have been conducted |
| C．had conducted |
| D．had been conducted |
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