题文
It is difficult for any of us to eat better, exercise more, and sleep enough, ________we know
we should.
| A．because | B．even if |
| C．unless | D．before |
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It is difficult for any of us to eat better, exercise more, and sleep enough, ________we know
we should.
| A．because | B．even if |
| C．unless | D．before |
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