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