单项选择题

Never ______ to the U. S. A..

A) I have been
B) do I have
C) have I been
D) have I do
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单项选择题
Many a teacher in our department ______ abroad.
A) have been
B) has been
C) have go
D) has go
单项选择题
The advisers propose that the plan ______ postponed for a few weeks.
A) been
B) to be
C) be
D) being
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