___you may have,you should gather your courage to face the challenge
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
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___you may have,you should gather your courage to face the challenge
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
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