题文
________everybody enjoys fresh cut flowers around his house，few people know how to keep them for as long as possible.
| A．Because |
| B．Since |
| C．While |
| D．If |
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________everybody enjoys fresh cut flowers around his house，few people know how to keep them for as long as possible.
| A．Because |
| B．Since |
| C．While |
| D．If |
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