单项选择题

It's really nice ______ you ______ help me ______ my biology.

A．of; to; with
B．for; to; in
C．of; for; on
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单项选择题
--Where is Li Ping --She ______ Beijing.
A．has gone to
B．has been to
C．went
单项选择题
They ______ English for 5 years.
A．have learned
B．learned
C．learn
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