Each person at the reunion was required to talk to other relatives to find out if they would buy one of the histories _______ it were printed A. whether B. if C. when D. after

Each person at the reunion was required to talk to other relatives to find out if they would buy one of the histories _______ it were printed
A. whether
B. if
C. when
D. after

出自：河南大学大学英语

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