6. The document is ________. Be sure that no one gets to read it except you.
(A)respectful
(B) lucrative
(C)irritable
(D) confidential
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統計: A(19), B(44), C(38), D(109), E(0) #1571044
統計: A(19), B(44), C(38), D(109), E(0) #1571044