单项选择题

Much ______ my regret, I am unable to accept your kind invitation.

A．to
B．at
C．with
D．by
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单项选择题
Mum is getting old, so her memory is not very ______ these days.
A．true
B．forgettable
C．reliable
D．credit
单项选择题
If ______ to speak, he has no problem expressing himself.
A．asked
B．asking
C．ask
D．to be asked
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