____is known to all, good friends _________ happiness and value to life.
| A．It; add |
| B．As; add |
| C．It; add up |
| D．As; add to |
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____is known to all, good friends _________ happiness and value to life.
| A．It; add |
| B．As; add |
| C．It; add up |
| D．As; add to |
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