单项选择题

______ it is wise to invest in the new project is being discussed.

A．Whether
B．If
C．Weather
D．What
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单项选择题
We regret ______ you that our research department will no longer provide services.
A．informed
B．inform
C．to inform
D．informing
单项选择题
Customers are very angry ______ the delay of the ordered goods.
A．with
B．at
C．to
D．from
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