It is not a problem ______ we can win the battle；it's just a matter of time．（ ）
| A． |
whether |
B． |
why |
C． |
when |
D． |
where |
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It is not a problem ______ we can win the battle；it's just a matter of time．（ ）
| A． |
whether |
B． |
why |
C． |
when |
D． |
where |
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