He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.
| A．wouldn't | B．shouldn't |
| C．couldn't | D．mustn't |
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He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.
| A．wouldn't | B．shouldn't |
| C．couldn't | D．mustn't |
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