题文
______ regular exercise is very important,it's never a good idea to exercise tooclose to bedtime.(2011 .天津)
| A．It |
| B．As |
| C．Although |
| D．Unless |
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______ regular exercise is very important,it's never a good idea to exercise tooclose to bedtime.(2011 .天津)
| A．It |
| B．As |
| C．Although |
| D．Unless |
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