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题目内容
（河南科技大学大学英语3(专升本)）
They have sent all the invitations to their relatives and friends, ______?
选项:
A:have they
B:did they
C:haven.t they
D:didn.t they
选项:
A:have they
B:did they
C:haven.t they
D:didn.t they
参考答案
