单项选择题

Sliver is the best conductor of electricity, copper ______ it closely.

A．followed
B．following
C．to follow
D．being followed
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单项选择题
I'm sorry ______ answered your letter earlier.
A．having not
B．not having
C．not to have
D．to not have
单项选择题
The alarm clock didn't ring this morning. I ______ it last night.
A．did forgotten to wind
B．may have forgotten winding
C．ought to have forgotten to wind
D．must have forgotten to wind
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