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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--Have you got a new desk --No, I ______.
A．don't
B．haven't
C．doesn't
单项选择题
Pens ______ by people for writing.
A．use
B．using
C．are used
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