单项选择题

______ it or not, his discovery has created a stir in scientific circles.

A．Believe
B．Believed
C．To believe
D．Believing
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单项选择题
If we ______ timely changes to the plan, a great deal of time and money would have been lost.
A．shall not make
B．would not make
C．did not make
D．had not made
单项选择题
Lucy did not have time to go to the concert last night because she was busy ______ for her English test.
A．being prepared
B．to be prepared
C．to prepare
D．preparing
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