题目列表(包括答案和解析)
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
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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