单项选择题

______ an answer, he decided to write another letter to them.

A．Having been received
B．To have received
C．Having received
D．Being received
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单项选择题
Have you ever been to the village ______ Chairman Mao once lived and worked
A．that
B．what
C．where
D．which
单项选择题
Don't ______ to ask me if anything is not clear to you.
A．doubt
B．hesitate
C．mind
D．worry
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