单项选择题

The negotiation lasted for two hours, and finally we agreed ______ the con- tract.

A．at
B．on
C．with
D．to
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单项选择题
Look, John must be in a hurry. He ______ his sweater inside out.
A．was wearing
B．wears
C．is wearing
D．wore
单项选择题
______ rapidly by the body, sugar provides a quick energy source.
A．Digested
B．To digest
C．Digesting
D．Having digested
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