单项选择题

Do ______ you are told.

A．after
B．as if
C．where
D．as
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单项选择题
I forgot ______ a letter to him, so I wrote to him just now.
A．writing
B．having wrote
C．to have written
D．to write
单项选择题
If you are in difficulty, don't hesitate to ask______my help.
A．to
B．about
C．from
D．for
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