单项选择题

He _________a good knowledge of English by careful study.

A．gained
B．obtained
C．earned
D．acquired
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单项选择题
If you have any questions, please go and ask_________.
A．the responsible person for the activity
B．the person responsible for the activity
C．the activity's responsible person
D．the person for the activity responsible
单项选择题
He reminded _________the letter at once so that it could catch the first post the next morning.
A．me of writing
B．me to write
C．my writing
D．me writing
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