单项选择题

The seller signed the ______, promising to ship the goods before the end of July.

A．contact
B．treaty
C．contrast
D．contract
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单项选择题
I enjoy the peaceful and ______ environment of the country.
A．silence
B．comfortable
C．leisure
D．quiet
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As a kind-hearted gentleman, my uncle's only fault seemed to be ______ he was too careless.
A．that
B．what
C．why
D．where
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