摘要： It was announced that only when visitors’ identities been checked, to get in. A. has; they are allowed B. had; were they allowed C. had; they were allowed D. has; are they allowed
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It was announced that only when visitors’ identities_______ been checked, _______to get in.
A．has; they are allowed B．had; were they allowed
C．had; they were allowed D．has; are they allowed
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