题文
During the Second World War, once before, the U-boats had been _____ because of air attack.
| A．in trouble |
| B．in the trouble |
| C．for trouble |
| D．within trouble |
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During the Second World War, once before, the U-boats had been _____ because of air attack.
| A．in trouble |
| B．in the trouble |
| C．for trouble |
| D．within trouble |
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