( ) .It's ____ must to have ____ good kowledge of English nowdays.A.a;a B.a;an C.a;/ D./;a 选什么 并说明原因.
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题目内容：
( ) .It's ____ must to have ____ good kowledge of English nowdays.
A.a;a B.a;an C.a;/ D./;a 选什么 并说明原因.
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