问题
选择题
This series of products ______ in special price for a month to promote its sales from next month.
A．are
B．is
C．has been
D．is to be
答案
答案：D
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This series of products ______ in special price for a month to promote its sales from next month.
A．are
B．is
C．has been
D．is to be
答案：D
