you may have , you should gather your courage to face the challenge .
| A．However serious a problem |
| B．Whatever serious a problem |
| C．However a serious problem |
| D．No matter how a serious |
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you may have , you should gather your courage to face the challenge .
| A．However serious a problem |
| B．Whatever serious a problem |
| C．However a serious problem |
| D．No matter how a serious |
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