问题
单项选择题
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
答案
参考答案：B
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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
参考答案：B